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  • Engineering  (1.327)
  • Malaysia
  • Oceanography
  • 2020-2023
  • 2000-2004  (90)
  • 1995-1999  (1.539)
  • 2001  (90)
  • 1999  (86)
  • 1998  (702)
  • 1997  (751)
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  • 2020-2023
  • 2000-2004  (90)
  • 1995-1999  (1.539)
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  • 1
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    Four new species of Adicella MacLachlan (Trichoptera: Leptoceridae: Triaenodini) from Sabah, East Malaysia (1997)
    In:  Zoologische Mededelingen vol. 71 no. 21, pp. 261-268
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Four new species of Adicella MacLachlan, 1877, A. anakpanah spec, nov., A. bavanga spec, nov., A. danumensis spec, nov., and A. gada spec, nov., from Sabah (Borneo), East Malaysia, are described and figured.
    Schlagwort(e): Trichoptera ; Adicella ; taxonomy ; Sabah ; Malaysia
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
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    ARTIKEL (OA)
  • 2
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    Preliminary checklist of Cetacea in the Indonesian Archipelago and adjacent waters (1997)
    In:  Zoologische Verhandelingen vol. 312 no. 1, pp. 1-48
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Records of 29 species of cetaceans from the Indonesian Archipelago have been gleaned from published and unpublished sources, representing five families: Phocoenidae (1 species), Delphinidae (16), Ziphiidae (3), Physeteridae (3), and Balaenopteridae (6). The presence of 26 species could be confirmed by material in museum collections, photographs or documentation by specialists. The occurrence of three species is still unconfirmed.
    Schlagwort(e): Cetacea ; Indonesia ; Malaysia ; Brunei ; Singapore ; Indian Ocean ; Pacific Ocean.
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
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  • 3
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    Alfred Russel Wallace\xe2\x80\x99s record of his consignments to Samuel Stevens, 1854-1861 (2001)
    In:  Zoologische Mededelingen vol. 75, 16-25, pp. 251-341
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: An annotated facsimile of those pages of Alfred Russel Wallace\xe2\x80\x99s notebook recording his consignments from the Malay Archipelago to his London agent, Samuel Stevens, is provided. Records of individual consignments are linked with the stages of Wallace\xe2\x80\x99s and Charles Allen\xe2\x80\x99s itineraries to which they relate and are amplified from data provided by Wallace elsewhere; wherever possible, dates and places of the despatch of consignments and of the dates of their receipt in London are noted; and the dates of material becoming available for study are established, chiefly from British Museum accessions registers. It is intended that this should provide readier access to scattered collection data and should in particular assist in determining what specimens may properly be regarded as types or syntypes of the many taxa described by numerous contemporary authors from Wallace\xe2\x80\x99s material.
    Schlagwort(e): A.R. Wallace ; C. Allen ; S. Stevens ; Malaysia ; Indonesia ; biography ; biogeography ; biodiversity
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
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  • 4
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    The Caddisfly Triaenodes pellectus Ulmer (Trichoptera, Leptoceridae: Triaenodini) taken in Sabah, East Malaysia (2001)
    In:  Zoologische Mededelingen vol. 75, 16-25, pp. 381-384
    Details
    Publikationsdatum: 2024-01-12
    Beschreibung: Triaenodes pellectus Ulmer is recorded from Sabah on the Island of Borneo, constituting the southernmost record of this widespread species. A checklist of the Triaenodes species from the southeast Asian islands and New Guinea is given.
    Schlagwort(e): Trichoptera ; Triaenodes pellectus ; Sabah ; Malaysia
    Repository-Name: National Museum of Natural History, Netherlands
    Materialart: info:eu-repo/semantics/article
    Format: application/pdf
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  • 5
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    Wind Induced Sediment Resuspension in a Microtidal Estuary (1999)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: Bottom sediment resuspension frequency, duration and extent (% of bottom sediments affected) were characterized for the fifteen month period from September 1995 to January 1997 for the Barataria Basin, LA. An empirical model of sediment resuspension as a function of wind speed, direction, fetch and water depth was derived from wave theory. Water column turbidity was examined by processing remotely sensed radiance information from visible and near-IR AVHRR imagery. Based on model predictions, wind induced resuspension occurred during all seasons of this study. Seasonal characteristics for resuspension reveal that late fall, winter and early spring are the periods of most frequent and intense resuspension. Model predictions of the critical wind speed required to induce resuspension indicate that winds of 4 m/s (averaged over all wind directions resuspend approximately 50% of bottom sediments in the water bodies examined. Winds of this magnitude (4 m/s) occurred for 80% of the time during the late fall, winter and early spring and for approximately 30% of the time during the summer. More than 50% of the bottom sedimets are resuspended throughout the year, indicating the importance of resuspension as a process affecting sediment and biogeochemical fluxes in the Barataria Basin.
    Schlagwort(e): Oceanography
    Materialart: SE-1999-05-00018-SSC
    Format: application/pdf
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  • 6
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    Role of Ocean Currents and Bottom Pressure Variability on Seasonal Polar Motion (1999)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: Changes in the ocean angular momentum (OAM) components about the equatorial axes, either due to fluctuations in currents or bottom pressure (mass redistribution), can induce movements of the Earth's pole of rotation, commonly referred to as polar motion or wobble. Output from a 1 deg resolution ocean model is used to calculate the effective equatorial OAM functions chi(sub 1, sup O) and chi(sub 2, sup O), corresponding to polar motion excitation about the equatorial axis pointing to the Greenwich and 90 deg E meridians, respectively. Time series of chi(sup O) are combined with similar atmospheric series chi(sup A), computed from the National Centers for Environmental Prediction/National Center for Atmospheric Research reanalyses, to interpret the observed low-frequency polar motion excitation for the period 1985-1996. Results indicate that the oceans are a very important excitation source for the Chandler (approximately 433 days), annual, and semiannual wobbles, providing for much better amplitude and phase agreement with the observed excitation at these periods, in comparison with what is obtained when only the atmosphere is considered. Both oceanic mass and motion terms are found to be important but with mass signals having somewhat larger amplitudes. The role of regional variability in ocean currents and bottom pressure in contributing to chi(sup O) signals is quantified. Midlatitude regions (approximately 30 deg - 70 deg) figure prominently as places of strong local oceanic excitation signals. The North Pacific basin is found to be generally important for chi(sup O) excitation, while the Southern Ocean is important for both chi(sub 1, sup O) and chi(sub 2, sup O). The largest positive covariances of local with global chi(sup O) signals occur in the Kuroshio region near the western boundary of the North Pacific for chi(sub 1, sup O) and southwest of Australia for chi(sub 2, sup O).
    Schlagwort(e): Oceanography
    Materialart: Paper-199JC900222 , Journal of Geophysical Research (ISSN 0148-0227); 104; C10; 23,292-23,409
    Format: text
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  • 7
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    A Well-Calibrated Ocean Algorithm for Special Sensor Microwave/Imager (1997)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: I describe an algorithm for retrieving geophysical parameters over the ocean from special sensor microwave/imager (SSM/I) observations. This algorithm is based on a model for the brightness temperature T(sub B) of the ocean and intervening atmosphere. The retrieved parameters are the near-surface wind speed W, the columnar water vapor V, the columnar cloud liquid water L, and the line-of-sight wind W(sub LS). I restrict my analysis to ocean scenes free of rain, and when the algorithm detects rain, the retrievals are discarded. The model and algorithm are precisely calibrated using a very large in situ database containing 37,650 SSM/I overpasses of buoys and 35,108 overpasses of radiosonde sites. A detailed error analysis indicates that the T(sub B) model rms accuracy is between 0.5 and 1 K and that the rms retrieval accuracies for wind, vapor, and cloud are 0.9 m/s, 1.2 mm, and 0.025 mm, respectively. The error in specifying the cloud temperature will introduce an additional 10% error in the cloud water retrieval. The spatial resolution for these accuracies is 50 km. The systematic errors in the retrievals are smaller than the rms errors, being about 0.3 m/s, 0.6 mm, and 0.005 mm for W, V, and L, respectively. The one exception is the systematic error in wind speed of -1.0 m/s that occurs for observations within +/-20 deg of upwind. The inclusion of the line-of-sight wind W(sub LS) in the retrieval significantly reduces the error in wind speed due to wind direction variations. The wind error for upwind observations is reduced from -3.0 to -1.0 m/s. Finally, I find a small signal in the 19-GHz, horizontal polarization (h(sub pol) T(sub B) residual DeltaT(sub BH) that is related to the effective air pressure of the water vapor profile. This information may be of some use in specifying the vertical distribution of water vapor.
    Schlagwort(e): Oceanography
    Materialart: NASA-CR-205101 , NAS 1.26:205101 , Paper-96JC01751 , Journal of Geophysical Research (ISSN 0148-0227); 102; C4; 8703-8717
    Format: application/pdf
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  • 8
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    Combination of TOPEX/POSEIDON Data with a Hydrographic Inversion for Determination of the Oceanic General Circulation and its Relation to Geoid Accuracy (1997)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: A global estimate of the absolute oceanic general circulation from a geostrophic inversion of in situ hydrographic data is tested against and then combined with an estimate obtained from TOPEX/POSEIDON altimetric data and a geoid model computed using the JGM-3 gravity-field solution. Within the quantitative uncertainties of both the hydrographic inversion and the geoid estimate, the two estimates derived by very different methods are consistent. When the in situ inversion is combined with the altimetry/geoid scheme using a recursive inverse procedure, a new solution, fully consistent with both hydrography and altimetry, is found. There is, however, little reduction in the uncertainties of the calculated ocean circulation and its mass and heat fluxes because the best available geoid estimate remains noisy relative to the purely oceanographic inferences. The conclusion drawn from this is that the comparatively large errors present in the existing geoid models now limit the ability of satellite altimeter data to improve directly the general ocean circulation models derived from in situ measurements. Because improvements in the geoid could be realized through a dedicated spaceborne gravity recovery mission, the impact of hypothetical much better, future geoid estimates on the circulation uncertainty is also quantified, showing significant hypothetical reductions in the uncertainties of oceanic transport calculations. Full ocean general circulation models could better exploit both existing oceanographic data and future gravity-mission data, but their present use is severely limited by the inability to quantify their error budgets.
    Schlagwort(e): Oceanography
    Materialart: NASA-CR-204735 , NAS 1.26:204735 , Geophysical Journal International; 128; 708-722
    Format: application/pdf
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  • 9
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    Participation in the 1996 Arlindo Cruise to the Indonesian Seas (1997)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: The objective of Arlindo-Productivity is to understand the factors responsible for regional differences in the response of phytoplankton and zooplankton to the SE and NW Monsoons in Indonesia. The hypothesis is that an interplay between circulation and shoaling of the nutricline, as a response to the monsoons, regulates productivity in the Indonesian Seas. My o@jective for the cruise in 1996 was to continue our collaboration with Indonesian scientists by conducting a set of hydrographic, primary production and spectral irradiance observations in the Indonesian Seas. This grant paid for shipping, travel and incidental costs associated with participation in the cruise in December, 1996. Ship costs were borne by the Indonesian Institute of Sciences as part of the collaborative effort. A plan for Arlindo in 1996 was agreed upon in March, 1996, by Indonesian scientists together with Arnold Gordon. The plan called for a 20-day physical oceanography and mooring cruise in November, 1996, followed by a 5-day bio-optical cruise. The bio-optical cruise departed from, and returned to, Ambon, and sampled in the Banda Sea. We completed a series of chlorophyll analyses, both a sampling of surface variability and depth profiles in the Banda Sea. We also completed three MER profiles for depth profiles of spectral irradiance. These data have a useful by-product in that they can be used for vicarious calibration of the OCTS sensor aboard the ADEOS satellite. As such, the data has been transmitted to NASDA in Japan for their use.
    Schlagwort(e): Oceanography
    Format: application/pdf
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  • 10
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    Bio-Optical Properties of the Arabian Sea as Determined by In-Situ and SeaWifs Data (1998)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: The overall objective of this work was to characterize optical and fluorescence properties in the euphotic zone during two British Ocean Flux Study (BOFS) Arabian Sea cruises. This was later expanded in 1995 to include three U.S. Joint Global Ocean Flux Study (JGOFS) Arabian Sea Cruises. The region was to be divided into one or more "bio-optical provinces", within each of which a single set of regression models was to be developed to relate the vertical distribution of irradiance attenuation and normalized fluorescence (SF and NF) to remote sensing reflectance and diffuse attenuation coefficient [K(490)]. The working hypothesis was that over relatively large spatial and temporal scales, the vertical profiles of bio-optical properties were predictable.
    Schlagwort(e): Oceanography
    Materialart: CHORS-TM-004-97
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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