ALBERT

Note: Table of Contents: SECTION A: MODERN OCEAN AND SEA-ICE PROCESSES. - Features of Seasonal and Interannual Variability of the Sea Level and Water Circulation in the Laptev Sea / V. K. Pavlov and P. V. Pavlov. - Numerical Modelling of Storm Surges in the Laptev Sea Based on the Finite Element Method / I. Ashik and A. Novakov. - Large-Scale Variations of Sea Level in the Laptev Sea / G. N. Voinov and E. A. Zakharchuk. - Extreme Oscillations of the Sea Level in the Laptev Sea / I. Ashik, Y. Dvorkin and Y. Vanda. - Internal Waves in the Laptev Sea / E. A. Zakharchuk. - The Composition of the Coarse Fraction of Aerosols in the Marine Boundary Layer over the Laptev, Kara and Barents Seas / V. P. Shevchenko, A. P. Lisitzin, R. Stein, V. V. Serova, A. B. Isaeva and N. V. Politova. - New Data on Sea-Ice Albedo in the Laptev and Barents Seas / B. V. Ivanov. - Possible Causes of Radioactive Contamination in the Laptev Sea / V. K. Pavlov, V. V. Stanovoy and A. I. Nikitin. - Oceanographic Causes for Transarctic Ice Transport of River Discharge / I. Dmitrenko, P. Golovin, V. Gribanov and H. Kassens. - Step-Like Vertical Structure Formation Due to Turbulent Mixing of Initially Continuous Density Gradients / A. Zatsepin, S. Dikarev, S. Poyarkov, N. Sheremet, I. Dmitrenko, P. Golovin and H. Kassens. - Dissolved and Paniculate Major and Trace Elements in Newly Formed Ice from the Laptev Sea (Transdrift III, October 1995) / J. A. Hölemann, M. Schirmacher and A. Prange. - Particle Entrainment into Newly Forming Sea Ice - Freeze-Up Studies in October 1995 / F. Lindemann, J. A. Holemann, A. Korablev and A. Zachek. - Frazil Ice Formation during the Spring Flood and its Role in Transport of Sediments to the Ice Cover / P. Golovin, I. Dmitrenko, H. Kassens and J. A. Hölemann. - SECTION B: THE MARINE ECOSYSTEM. - Pelagic-Benthic Coupling in the Laptev Sea Affected by Ice Cover / C. Grahl, A. Boetius and E.-M. Nöthig. - Chlorophyll a Distribution in Water Column and Sea Ice during the Laptev Sea Freeze-Up Study in Autumn 1995 / K. v. Juterzenka and K. Knickmeier. - Composition, Abundance and Population Structure of Spring-Time Zooplankton in the Shelf-Zone of Laptev Sea / E. N. Abramova. - Macrobenthos Distribution in the Laptev Sea in Relation to Hydrology / V. V. Petryashov, B. I. Sirenko, A. A. Golikov, A. V. Novozhilov, E. Rachor, D. Piepenburg and M. K. Schmid. - Carepoctus solidus sp.n., a New Species of Liparid Fish (Scorpaeniformes, Liparidae) from the Lower Bathyal of the Polar Basin / N. V. Chernova. - Spring Stopover of Birds on the Laptev Sea Polynya / D. V. Solovieva. - SECTION C: LAND-OCEAN INTERACTIONS AND PATHWAYS. - Major, Trace and Rare Earth Element Geochemistry of Suspended Particulate Material of East Siberian Rivers Draining to the Arctic Ocean / V. Rachold. - Carbon Isotope Composition of Particulate Organic Material in East Siberian Rivers / V. Rachold and H.-W. Hubberten. - Distribution of River Water and Suspended Sediment Loads in the Deltas of Rivers in the Basins of The Laptev and East-Siberian Seas / V. V. Ivanov and A. A. Piskun. - Dissolved Oxygen, Silicon, Phosphorous and Suspended Matter Concentrations During the Spring Breakup of The Lena River / S. V. Pivovarov, J. A. Hölemann, H. Kassens, M. Antonow and I. Dmitrenko. - Distribution Patterns of Heavy Minerals in Siberian Rivers, the Laptev Sea and the eastern Arctic Ocean: An Approach to Identify Sources, Transport and Pathways of Terrigenous Matter / M. Behrends, E. Hoops and B. Peregovich. - The Role of Coastal Retreat for Sedimentation in the Laptev Sea / F. E. Are. - SECTION D: TERRESTRIAL ENVIRONMENT - PAST AND PRESENT. - Seasonal Changes in Hydrology, Energy Balance and Chemistry in the Active Layers of Arctic Tundra Soils in Taymyr Peninsula, Russia / J. Boike and P. P. Overduin. - The Landscape and Geobotanical Characteristics of the Levinson-Lessing Lake Basin, Byrranga Mountains, Central Taimyr / M. A. Anisimov and I. N. Pospelov. - Studies of Methane Production and Emission in Relation to the Microrelief of a Polygonal Tundra in Northern Siberia / V. A. Samarkin, A. Gundelwein and E.-M. Pfeiffer. - Carbon Dioxide and Methane Emmissions at Arctic Tundra Sites in North Siberia / M. Sommerkom, A. Gundelwein, E.-M. Pfeiffer and M. Bolter. - The Features of the Hydrological Regime of the Lake-River Systems of the Byrranga Mountains (by the Example of the Levinson-Lessing Lake) / V. P. Zimichev, D. Yu. Bolschyanov, V. G. Mesheryakov and D. Gintz. - Lead-210 Dating and Heavy Metal Concentration in Recent Sediments of Lama Lake (Norilsk Area, Siberia) / B. Hagedorn, S. Harwart, M. M. R. van der Loeff and M. Melles. - Late Weichselian to Holocene Diatom Succession in a Sediment Core from Lama Lake, Siberia and Presumed Ecological Implications / U. Kienel. - Climate and Vegetation History of the Taymyr Peninsula since Middle Weichselian Time - Palynological Evidence from Lake Sediments / J. Hahne and M. Melles. - Laminated Sediments from Levinson-Lessing Lake, Northern Central Siberia - A 30,000 Year Record of Environmental History? / T. Ebel, M. Melles and F. Niessen. - High-Resolution Seismic Stratigraphy of Lake Sediments on the Taymyr Peninsula, Central Siberia / F. Niessen, T. Ebel, C. Kopsch and G. B. Fedorov. - Archaeological Survey in Central Taymyr / V. V. Pitul'ko. - Marine Pleistocene Deposits of the Taymyr Peninsula and their Age from ESR Dating / D. Bolshiyanov and A. Molodkov. - Paleoclimatic Indicators from Permafrost Sequences in the Eastern Taymyr Lowland / C. Siegert, A. Yu. Derevyagin, G.N. Shilova, W.-D. Hermichen and A. Hiller. - SECTION E: MARINE DEPOSITIONAL ENVIRONMENT - PAST AND PRESENT. - Stable Oxygen Isotope Ratios in Benthic Carbonate Shells of Ostracoda, Foraminifera, and Bivalvia from Surface Sediments of the Laptev Sea, Summer 1993 and 1994 / H. Erlenkeuser and U. von Grafenstein. - Determination of Depositional Beryllium-10 Fluxes in the Area of the Laptev Sea and Beryllium-10 Concentrations in Water Samples of High Northern Latitudes / C. Strobl, V. Schulz, S. Vogler, S. Baumann, H. Kassens, P. W. Kubik, M. Suter and A. Mangini. - Spatial Distribution of Diatom Surface Sediment Assemblages on the Laptev Sea Shelf (Russian Arctic) / H. Cremer. - Diatoms from Surface Sediments of the Saint Anna Trough (Kara Sea) / R. N. Djinoridze, G. I. Ivanov, E. N. Djinoridze, and R. F. Spielhagen. - Distribution of Aquatic Palynomorphs in Surface Sediments from the Laptev Sea, Eastern Arctic Ocean / M. Kunz-Pirrung. - Distribution of Pollen and Spores in Surface Sediments of the Laptev Sea / O. D. Naidina and H. A. Bauch. - Clay Mineral Distribution in Surface Sediments of the Laptev Sea: Indicator for Sediment Provinces, Dynamics and Sources / B. T. Rossak, H. Kassens, H. Lange and J. Thiede. - Planktic Foraminifera in Holocene Sediments from the Laptev Sea and the Central Arctic Ocean: Species Distribution and Paleobiogeographical Implication / H. A. Bauch. - Holocene Diatom Stratigraphy and Paleoceanography of the Eurasian Arctic Seas / Y. Polyakova. - Late Quaternary Organic Carbon and Biomarker Records from the Laptev Sea Continental Margin (Arctic Ocean): Implications for Organic Carbon Flux and Composition / R. Stein, K. Fahl, F. Niessen and M. Siebold. - Late Pleistocene Paleoriver Channels on the Laptev Sea Shelf - Implications from Sub-Bottom Profiling / H. P. Kleiber and F. Niessen. - Main Structural Elements of Eastern Russian Arctic Continental Margin Derived from Satellite Gravity and Multichannel Seismic Reflection Data / S. S. Drachev, G. L. Johnson, S. W. Laxon, D. C. McAdoo and H. Kassens. - High Resolution Seismic Studies in the Laptev Sea Shelf: First Results and Future Needs / B. Kim, G. Grikurov and V. Soloviev. - SECTION F: SUMMARY. - Dynamics and History of the Laptev Sea and its Continental Hinterland: A Summary / J. Thiede, L. Timokhov, H. A. Bauch, D. Bolshiyanov, I. Dmitrenko

Note: Inhaltsverzeichnis 1 Berlin: Die Wiege der Stratosphärenforschung 1.1 Erste meteorologische Beobachtungen 1.2 Die Erforschung der Freien Atmosphäre 1.2.1 Bemannte Freiballonfahrten 1.2.2 Unbemannte Registrierballone 1.3 Die Entdeckung der Stratosphäre 1.4 Das Observatorium Lindenberg 1.4.1 Die Entdeckung der BERSON-Westwinde am Äquator 1.5 Das Institut für Meteorologie der FU Berlin 1.5.1 Die Entdeckung des Berliner Phänomens 1.5.2 Eine erste Klimatologie 1.5.3 Erste tägliche Wetterkarten von der Stratosphäre 1.5.4 Die Entdeckung des Einflusses der Sonne Literatur 2 Kurzbeschreibung der Klimatologie 2.1 Was für Daten haben wir heute? 2.2 Der mittlere Zustand der Stratosphäre 2.2.1 Die Temperatur von Pol zu Pol 2.2.2 Der Wind von Pol zu Pol 2.2.3 Die Zirkulation von Pol zu Pol 2.2.4 Monatsmittelkarten über der Nordhemisphäre 2.2.5 Monatsmittelkarten über der Südhemisphäre 2.3 Variabilität und Trends 2.3.1 Variabilität der Temperatur von Jahr zu Jahr 2.3.2 Temperaturtrends in der Stratosphäre Literatur 3 Warme und kalte Winter in der Stratosphäre 3.1 Einleitung 3.2 Major Midwinter Warming 3.2.1 Einteilung der Stratosphärenerwärmungen 3.2.2 Das "Major Midwinter Warming" im Winter 1990/91 3.2.3 Schema einer Stratosphärenerwärmung 3.3 Zusammenhänge 3.3.1 Die Southern Oscillation (SO) 3.3.2 Die Quasi-Biennial Oscillation (QBO) 3.3.3 Das solare Signal im Nordwinter 3.3.4 Vulkane und kalte Winter in der arktischen Stratosphäre 3.4 Vergleich zwischen Arktis und Antarktis 3.5 Modellexperimente Literatur 4 Die Quasi-Biennial Oscillation 4.1 Frühe Beobachtungen 4.2 Die Entdeckung der QBO 4.3 Heutiger Kenntnisstand 4.4 Zusammenhang mit den hohen Breiten Literatur 5 Die Ozonschicht und ihre Probleme 5.1 Einleitung 5.2 Frühe Beobachtungen 5.2.1 Dobsons frühes Meßnetz 5.2.2 Der Ozongehalt über Tromsö 5.3 Die natürliche Verteilung des Gesamtozons 5.4 Anthropogene Ozonabnahme in der Stratosphäre 5.4.1 Katalytische Ozonzerstörung 5.4.2 "Ozonloch" über der Antarktis 5.4.3 Trends im stratosphärischen Ozongehalt 5.4.4 Maßnahmen zur Reduktion des Chlorgehalts Literatur 6 Der 11jährige Sonnenfleckenzyklus 6.1 Einleitung 6.2 Das solare Signal im Lauf des Jahres 6.2.1 Nordhemisphäre 6.2.2 Südhemisphäre 6.2.3 Globale Korrelationen 6.3 Eine Verbindung zur tropischen Troposphäre? 6.4 Gesamtozongehalt und der Sonnenfleckenzyklus 6.5 Suche nach dem Mechanismus . Literatur 7 Schlußbetrachtungen 7.1 Zusammenfassung des bisher Gesagten 7.2 Relevanz der Stratosphäre 7.3 Unerwartetes! Inhaltsverzeichnis Glossar Sachverzeichnis

Note: Inhaltsverzeichnis: 1 Einführung. - 1.1 Beispiele für Zeitreihen. - 1.2 Trendschätzung. - 1.3 Schätzung saisonaler Anteile in Zeitreihen. - Aufgaben. - 2 Stationarität und grundlegende Modelle der Zeitreihenanalyse. - 2.1 Stationarität von Zeitreihen. - 2.2 Grundlegende stationäre Zeitreihenmodelle. - 2.3 Empirische Autokovarianzen und Autokorrelationen. - 2.4 Gaußsche Zeitreihen. - 2.5 Die partielle Autokorrelation. - Aufgaben. - 3 Die Autokovarianz und die Autokorrelation. - 3.1 Grundlegende Eigenschaften. - 3.2 Spektralmaß und Spektraldichte. - Aufgaben. - 4 Lineare Vorhersage bei endlicher Vergangenheit. - 4.1 Die rekursive Gram-Schmidt-Orthogonalisierung. - 4.2 Die Levinson-Rekursion. - Aufgaben. - 5 Der Spektralsatz für stationäre Zeitreihen. - 5.1 Die Spektraldarstellung zyklischer Zeitreihen. - 5.2 Maße mit orthogonalen Werten und ein stochastisches Integral. - 5.3 Der Spektralsatz. - 5.4 Eine Substitutionsregel für stochastische Integrale. - Aufgaben. - 6 Filterung stationärer Zeitreihen. - 6.1 Grundbegriffe und einfache Eigenschaften von Filtern. - 6.2 Spezielle Filter. - 6.3 Zweiseitige MA-Reihen. - Aufgaben. - 7 ARMA-Modelle. - 7.1 Definition und Existenz von ARMA-Reihen. - 7.2 Kausalität und Invertibilität von ARMA-Reihen. - 7.3 Lineare Li-Filter. - Aufgaben. - 8 Die Autokovarianz und Autokorrelation von ARMA-Reihen im reellen Fall. - 8.1 Die Berechnung der Autokovarianzen von ARMA-Reihen aus der MA-Darstellung. - 8.2 Die Differenzengleichung für die Koeffizienten der MA-Darstellung. - 8.3 Die Differenzengleichung für die Autokovarianzen und die Yule-Walker-Gleichungen bei AR-Reihen. - 8.4 Identifizierbarkeit der Parameter von ARMA-Zeitreihen. - Aufgaben. - 9 Deterministische und rein nicht—deterministische Zeitreihen. - 9.1 Die Wold-Zerlegung. - 9.2 Approximation durch AR- und MA-Reihen. - Aufgaben. - 10 Asymptotische Eigenschaften von Schätzverfahren in linearen Zeitreihenmodellen. - 10.1 Einfache asymptotische Eigenschaften des Stichprobenmittels und der Stichprobenautokovarianz. - 10.2 Schwache Abhängigkeit. - 10.3 Ein zentraler Grenzwertsatz für schwach abhängige Zufallsvariable. - 10.4 Asymptotische Normalität des Stichprobenmittels und der Stichprobenautokovarianz. - Aufgaben. - 11 Parameterschätzung in ARMA Modellen 11.1 Parameterschätzung für autoregressive Zeitreihen. - 11.2 Maximum-Likelihood Schätzer im autoregressiven Modell. - 11.3 Parameterschätzung in autoregressiven Modellen mit wachsender Ordnung. - 11.4 Parameterschätzung für ARMA-Zeitreihen. - Aufgaben. - 12 Schätzen im Spektralbereich. - 12.1 Parametrische Spektraldichteschätzung. - 12.2 Das Periodogramm. - 12.3 Eigenschaften des Periodogramms. - 12.4 Lag-Window-Schätzer der Spektraldichte. - 12.5 Das geglättete Periodogramm. - 12.6 Konfidenzintervalle für die Spektraldichte. - 12.7 Das integrierte Periodogramm. - Aufgaben. - 13 Modellierung mit ARMA-Zeitreihen. - 13.1 ARIMA-Zeitreihen. - 13.2 Ordnungswahl in ARMA-Zeitreihen. - 13.3 Threshold Zeitreihenmodelle. - Aufgaben. - 14 Grundlagen finanzieller Zeitreihen. - 14.1 GARCH-Modelle. - 14.2 Parameterschätzung in GARCH-Modellen. - 14.3 Anwendung der GARCH-Methodik. - Aufgaben. - 15 Grundlagen multivariater Zeitreihen. - 15.1 Multivariate Spektraltheorie. - 15.2 Multivariate Filter. - 15.3 Der quadratische Kohärenzkoeffizient und verwandte Größen. - 15.4 Schätzer der Spektraldichtematrix. - 15.5 Multivariate ARMA-Reihen. - 15.6 Schätzung des Mittelwertvektors und der Autokovarianzmatrix einer multivariaten Zeitreihe. - 15.7 Lineare Vorhersage bei multivariaten Zeitreihen 354 15.8 Zustandsraummodelle. - 15.9 Der Kaiman-Filter zur linearen Vorhersage. - Aufgaben. - A Anhang. - A.1 Einige nützliche Formeln. - A.2 Integration komplexer Funktionen. - A.3 Elementare Hilbertraum Theorie. - A.4 Lösungen einer homogenen Differenzengleichung. - A.5 Konvergenzbegriffe in der Stochastik. - A.6 Die Moore-Penrose-Inverse. - XIV Inhaltsverzeichnis Literaturverzeichnis. -

Note: Contents: 1 Global Distribution of Lakes / M. MEYBECK. - 1 Introduction. - 2 Background Material and Approaches to Global Lake Census. - 2.1 Data Used. - 2.2 Approaches to Global Lake Census. - 3 General Laws of Lake Distribution. - 3.1 Lake Density . - 3.2 Limnic Ratio. - 4 Distribution of Lakes of Tectonic Origin. - 5 Lakes of Glacial Origin. - 5.1 Lake Densities. - 5.2 Global Deglaciated Area. - 5.3 Total Number of Glacial Lakes. - 6 Fluvial Lakes. - 7 Global Distribution of Crater Lakes. - 8 Global Distribution of Saline Lakes. - 8.1 Coastal Lagoons. - 8.2 Salinized Lakes due to Evaporation. - 9 Global Lake Distribution. - 9.1 Extrapolation Approach. - 9.2 Lake Type Approach. - 9.3 Climatic Typology Approach. - 9.4 Lake Distribution in Endorheic Areas. - 9.5 Global Dissolved Salt Distribution in Lakes. - 10 Major Changes in Global Lake Distribution in the Geological Past. - 10.1 Lake Ages. - 10.2 Historical Changes. - 10.3 Postglacial Changes. - 11 Discussion and Conclusions. - References. - 2 Hydrological Processes and the Water Budget of Lakes / T. C. WINTER. - 1 Introduction. - 2 Hydrological System with Regard to Lakes. - 2.1 Interaction of Lakes with Atmospheric Water. - 2.2 Interaction of Lakes with Surface Water. - 2.3 Interaction of Lakes with Subsurface Water. - 2.4 Change in Lake Volume. - 3 Summary. - References. - 3 Hydrological and Thermal Response of Lakes to Climate: Description and Modeling / S. W. HOSTETLER. - 1 Introduction. - 2 Hydrological Response. - 3 The Hydrological Budget. - 4 Hydrological Models. - 5 Thermal Response. - 5.1 Energy Budget and Energy Budget Models. - 5.2 Models and Modeling. - 6 Use of Models to Link Lakes with Climate Change. - 7 Input Data Sets. - 8 Sample Applications. - 9 Summary. - References. - 4 Mixing Mechanisms in Lakes / D. M. IMBODEN and A. WÜEST. - 1 Transport and Mixing. - 2 Lakes as Physical Systems. - 3 Fluid Dynamics: Mathematical Description of Advection and Diffusion. - 3.1 Equations of Fluid Motion. - 3.2 Turbulence, Reynolds' Stress, and Eddy Diffusion. - 3.3 Vertical Momentum Equation. - 3.4 Nonlocal Diffusion and Transilient Mixing. - 4 Density and Stability of Water Column. - 4.1 Equation of State of Water. - 4.2 Potential Temperature and Local Vertical Stability. - 5 Energy Fluxes: Driving Forces Behind Transport and Mixing. - 5.1 Thermal Energy. - 5.2 Potential Energy. - 5.3 Kinetic Energy. - 5.4 Turbulent Kinetic Energy Balance in Stratified Water. - 5.5 Internal Turbulent Energy Fluxes: Turbulence Cascade. - 6 Mixing Processes in Lakes. - 6.1 Waves and Mixing. - 6.2 Mixing in the Surface Layer. - 6.3 Diapycnal Mixing. - 6.4 Boundary Mixing. - 6.5 Double Diffusion. - 6.6 Isopycnal Mixing. - 7 Mixing and Its Ecological Relevance. - 7.1 Time Scales of Mixing. - 7.2 Reactive Species and Patchiness. - 7.3 Mixing and Growth: The Search for an Ecological Steering Factor. - References. - 5 Stable Isotopes of Fresh and Saline Lakes / J. R. GAT. - 1 Introduction. - 1.1 Isotope Separatio During Evaporation. - 2 Small-Area Lakes. - 2.1 Seasonal and Annual Changes. - 2.2 Deep Freshwater Lakes. - 2.3 Transient Surface-Water Bodies. - 3 Interactive and Feedback Systems. - 3.1 Network of Surface-Water Bodies. - 3.2 Recycling of Reevaporated Moisture into the Atmosphere. - 3.3 Large Lakes. - 3.4 Large-Area Lakes with Restricted Circulation. - 4 Saline Lakes. - 4.1 Isotope Hydrology of Large Salt Lakes. - 4.2 Ephemeral Salt Lakes and Sabkhas. - 5 Isotopie Paleolimnology. - 6 Conclusions: From Lakes to Oceans. - References. - 6 Exchange of Chemicals Between the Atmosphere and Lakes / P. VLAHOS, D. MACKAY, S. J. EISENREICH, and KC. HORNBUCKLE. - 1 Introduction. - 2 Air-Water Partitioning Equilibria. - 3 Diffusion Between Water and Air. - 4 Volatilization and Absorption: Double-Resistance Approach. - 5 Factors Affecting Mass-Transfer Coefficients. - 6 Partitioning of Chemical to Paniculate Matter in Air and Water. - 6.1 Air. - 6.2 Water. - 7 Atmospheric Deposition Processes. - 7.1 Dry Deposition. - 7.2 Wet Deposition. - 8 Specimen Calculation. - 8.1 Step 1: Physicochemical Properties. - 8.2 Step 2: Mass-Transfer Coefficients. - 8.3 Step 3: Sorption in Air and Water. - 8.4 Step 4: Equilibrium Status. - 8.5 Step 5: Volatilization and Deposition Rates. - 9 Role of Air-Water Exchange in Lake Mass Balances. - 10 Case Studies. - 10.1 Mass Balance on Siskiwit Lake, Isle Royale. - 10.2 Mass Balance on Lake Superior. - 10.3 Air-Water Exchange in Green Bay, Lake Michigan. - 10.4 Air-Water Exchange in Lake Superior. - 11 Conclusions. - References. - 7 Atmospheric Depositions: Impact of Acids on Lakes / W. STUMM and J. SCHNOOR. - Abstract. - 1 Introduction: Anthropogenic Generation of Acidity. - 1.1 Genesis of Acid Precipitation. - 2 Acidity and Alkalinity: Neutralizing Capacities. - 2.1 Transfer of Acidity (or Alkalinity) from Pollution Through the Atmosphere to Ecosystems. - 3 Acidification of Aquatic and Terrestrial Ecosystems. - 3.1 Disturbance of H+ Balance from Temporal or Spatial Decoupling of the Production and Mineralization of the Biomass. - 3.2 In Situ H+ Ion Neutralization in Lakes. - 3.3 Krug and Frink Revisited. - 4 Brønsted Acids and Lewis Acids: Pollution by Heavy Metals, as Influenced by Acidity. - 4.1 Cycling of Metals. - 4.2 Pb in Soils. - 5 Impact of Acidity on Ecology in Watersheds. - 5.1 Soils. - 5.2 Lakes. - 5.3 Nitrogen Saturation of Forests. - 6 Critical Loads. - 6.1 Critical Load Maps. - 6.2 Models for Critical Load Evaluation. - 7 Case Studies. - 7.1 Chemical Weathering of Crystalline Rocks in the Catchment Area of Acidic Ticino Lakes, Switzerland. - 7.2 Watershed Manipulation Project at Bear Brooks, Maine. - 8 Summary. - References. - 8 Redox-Driven Cycling of Trace Elements in Lakes / J. HAMILTON-TAYLOR and W. DAVISON. - 1 Introduction. - 2 Major Biogeochemical Cycles and Pathways. - 3 Iron and Manganese. - 3.1 Transformations and Cycling. - 3.2 Iron and Manganese Compounds as Carrier Phases. - 4 Sediment-Water Interface. - 4.1 Diffusive Flux from Sediments. - 4.2 Evidence of Little or No Diffusive Efflux from Sediments. - 4.3 Transient Remobilization. - 4.4 Diffusive Flux into Sediments. - 5 Pathways Involving Redox Reactions Directly: Case Studies. - 5.1 Arsenic. - 5.2 Chromium. - 5.3 239,240Pu. - 5.4 Selenium 6 Pathways Involving Redox Reactions Indirectly: Case Studies. - 6.1 137Cs. - 6.2 Stable Pb, 210Pb, and 210Po. - 6.3 Zinc. - 7 Summary and Conclusions. - References. - 9 Comparative Geochemistry of Marine Saline Lakes / F. T. MACKENZIE, S. VINK, R. WOLLAST, and L. CHOU. - 1 Introduction. - 2 General Characteristics of Marine Saline Lakes. - 3 Comparative Sediment-Pore-Water Reactions. - 3.1 Mangrove Lake, Bermuda. - 3.2 Solar Lake, Sinai. - 4 Conclusions. - References. - 10 Organic Matter Accumulation Records in Lake Sediments / P. A. MEYERS and R. ISHIWATARI. - 1 Introduction. - 1.1 Significance of Organic Matter in Lake Sediments. - 1.2 Origins of Organic Matter to Lake Sediments. - 1.3 Alterations of Organic Matter During Deposition. - 1.4 Similarities and Differences Between Organic Matter in Sediments of Lakes and Oceans. - 1.5 Dating of Lake-Sediment Records. - 2 Indicators of Sources and Alterations of Total Organic Matter in Lake Sediments. - 2.1 Source Information Preserved in C/N Ratios of Sedimentary Organic Matter. - 2.2 Source Information from Carbon-Stable Isotopic Compositions. - 2.3 Source Information from Nitrogen-Stable Isotopic Compositions. - 3 Origin and Alterations of Humic Substances. - 4 Sources and Alterations of Lipid Biomarkers. - 4.1 Alteration of Lipids During Deposition. - 4.2 Changes in Sources vs Selective Diagenesis. - 4.3 Effects of Sediment Grain Size on Geolipid Compositions. - 4.4 Source Records of Alkanes in Lake Sediments. - 4.5 Preserv