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  • 1
    Publication Date: 2005-09-17
    Description: We examined the number of tropical cyclones and cyclone days as well as tropical cyclone intensity over the past 35 years, in an environment of increasing sea surface temperature. A large increase was seen in the number and proportion of hurricanes reaching categories 4 and 5. The largest increase occurred in the North Pacific, Indian, and Southwest Pacific Oceans, and the smallest percentage increase occurred in the North Atlantic Ocean. These increases have taken place while the number of cyclones and cyclone days has decreased in all basins except the North Atlantic during the past decade.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Webster, P J -- Holland, G J -- Curry, J A -- Chang, H-R -- New York, N.Y. -- Science. 2005 Sep 16;309(5742):1844-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16166514" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2006-03-18
    Description: To better understand the change in global hurricane intensity since 1970, we examined the joint distribution of hurricane intensity with variables identified in the literature as contributing to the intensification of hurricanes. We used a methodology based on information theory, isolating the trend from the shorter-term natural modes of variability. The results show that the trend of increasing numbers of category 4 and 5 hurricanes for the period 1970-2004 is directly linked to the trend in sea-surface temperature; other aspects of the tropical environment, although they influence shorter-term variations in hurricane intensity, do not contribute substantially to the observed global trend.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoyos, C D -- Agudelo, P A -- Webster, P J -- Curry, J A -- New York, N.Y. -- Science. 2006 Apr 7;312(5770):94-7. Epub 2006 Mar 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA. choyos@eas.gatech.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/16543416" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
    Publication Date: 2009-07-04
    Description: Two distinctly different forms of tropical Pacific Ocean warming are shown to have substantially different impacts on the frequency and tracks of North Atlantic tropical cyclones. The eastern Pacific warming (EPW) is identical to that of the conventional El Nino, whereas the central Pacific warming (CPW) has maximum temperature anomalies located near the dateline. In contrast to EPW events, CPW episodes are associated with a greater-than-average frequency and increasing landfall potential along the Gulf of Mexico coast and Central America. Differences are shown to be associated with the modulation of vertical wind shear in the main development region forced by differential teleconnection patterns emanating from the Pacific. The CPW is more predictable than the EPW, potentially increasing the predictability of cyclones on seasonal time scales.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kim, Hye-Mi -- Webster, Peter J -- Curry, Judith A -- New York, N.Y. -- Science. 2009 Jul 3;325(5936):77-80. doi: 10.1126/science.1174062.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉School of Earth and Atmospheric Science, Georgia Institute of Technology, 311 Ferst Drive, Atlanta, GA 30332, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19574388" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
    Publication Date: 2015-12-15
    Description: Steinman et al. (Reports, 27 February 2015, p. 988) argue that appropriately rescaled multimodel ensemble-mean time series provide an unbiased estimate of the forced climate response in individual model simulations. However, their procedure for demonstrating the validity of this assertion is flawed, and the residual intrinsic variability so defined is in fact dominated by the actual forced response of individual models.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kravtsov, S -- Wyatt, M G -- Curry, J A -- Tsonis, A A -- New York, N.Y. -- Science. 2015 Dec 11;350(6266):1326. doi: 10.1126/science.aab3570.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mathematical Sciences, Atmospheric Science group, University of Wisconsin-Milwaukee, Post Office Box 413, Milwaukee, WI 53201, USA. kravtsov@uwm.edu. ; Department of Geological Sciences, University of Colorado, Boulder, CO, USA. ; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, USA. ; Department of Mathematical Sciences, Atmospheric Science group, University of Wisconsin-Milwaukee, Post Office Box 413, Milwaukee, WI 53201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26659048" target="_blank"〉PubMed〈/a〉
    Keywords: *Earth (Planet) ; *Global Warming
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
    Publication Date: 2017-03-10
    Description: To understand the relationship among easterly waves, tropical cyclones (TCs), and the large-scale environment, a robust climatology of easterly waves for the tropical Western Hemisphere has been developed. The foundation for the climatology is a new easterly wave tracking algorithm that identifies westwards propagating disturbances over the tropical East Pacific, Atlantic, and Africa. To assess the issue of track dependencies and easterly wave representation, climatologies are prepared separately from the NCEP-NCAR, CFS-R, ERA-40, and ERA-Interim reanalyses. The source code for the easterly wave-tracking algorithm along with the easterly wave climatology for each atmospheric reanalysis is publicly available from NOAA's National Centers for Environmental Information. To understand the relationship between easterly waves, tropical cyclones and the large-scale environment, a robust climatology of easterly waves for the tropical Western Hemisphere has been developed. The foundation for the climatology is a new easterly wave tracking algorithm that identifies westward-propagating disturbances over the tropical East Pacific, Atlantic, and Africa. To assess the issue of track dependencies and easterly wave representation, climatologies are prepared separately from the NCEP-NCAR, CFS-R, ERA-40, and ERA-Interim reanalyses.
    Electronic ISSN: 2049-6060
    Topics: Geosciences
    Published by Wiley on behalf of The Royal Meteorological Society.
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 51 (1993), S. 197-217 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary The relationship between clouds and the surface radiative fluxes over the Arctic Ocean are explored by conducting a series of modelling experiments using a one-dimensional thermodynamic sea ice model. The sensitivity of radiative flux to perturbations in cloud fraction and cloud optical depth are determined. These experiments illustrate the substantial effect that clouds have on the state of the sea ice and on the surface radiative fluxes. The effect of clouds on the net flux of radiation at the surface is very complex over the Arctic Ocean particularly due to the presence of the underlying sea ice. Owing to changes in surface albedo and temperature associated with changing cloud properties, there is a strong non-linearity between cloud properties and surface radiative fluxes. The model results are evaluated in three different contexts: 1) the sensitivity of the arctic surface radiation balance to uncertainties in cloud properties; 2) the impact of interannual variability in cloud characteristics on surface radiation fluxes and sea ice surface characteristics; and 3) the impact of climate change and the resulting changes in cloud properties on the surface radiation fluxes and sea ice characteristics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 56 (1995), S. 111-123 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Satellite data are used to study the cloud development and water vapor supply during the genesis of Typhoon Nina (November 1987). Using satellite microwave and infrared data, the following physical parameters are retrieved and analyzed: water vapor path, surface wind, sea surface evaporation, precipitation, and cloud type. During the week prior to the genesis of Nina, several cloud clusters were observed in the region of the subsequent genesis (near 5° N, 170° E). Cloud type studies showed that several clusters had similar structures. By examining the sea surface evaporation and precipitation in the cloud clusters, we found that the precipitation exceeded evaporation by several times in the precipitating areas of the cluster that evolved into a tropical storm, indicating that local evaporation alone could not supply enough water vapor, and that horizontal transfer of water vapor from surrounding areas is required for the tropical cyclogenesis. Surface wind fields indicated that there was a constant increase of cyclonic wind in the area of the cloud cluster that finally led to the tropical storm, while no apparent increase of wind was found in the other cloud clusters. In addition, water vapor amount did not decrease for several days until the disturbance was upgraded to a tropical storm, while it was found to decrease after the mature stage for the other cloud clusters that did not evolve into tropical storms. From consideration of the water vapor balance, the cyclogenesis can be interpreted as a transition from an unbalanced cluster to a balanced cluster. Horizontal transfer of water vapor in a water vapor-unbalanced cloud cluster is not large enough to overcome the deficit caused by precipitation over evaporation. The shortage of water vapor in the unbalanced cluster results in a short-lived cloud cluster. When the sum of evaporation and horizontal transfer can provide enough water vapor supply to balance the removal by precipitation (balanced cluster), the precipitation does not “dry up” the atmosphere. This is the necessary condition for the cyclogenesis. The increase in horizontal transfer of water vapor is found in this study to be associated with the increase of the surface cyclonic wind.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Meteorology and atmospheric physics 54 (1994), S. 141-156 
    ISSN: 1436-5065
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Summary Precipitation, cloud water amount and phase, and water vapor amount are very important parameters in understanding the development of typhoons and their influence on the atmosphere and ocean. In this paper, we investigate the atmospheric water balance of Typhoon Nina, which formed near (5°N, 160°E) on November 18, 1987 and moved northwestward during its development. Water vapor path, liquid water path, ice index, and precipitation amount are determined in the vicinity of the typhoon using data from the SSM/I (Special Sensor Microwave/Imager). The water balance of the, typhoon cloud is then examined during its different development stages. An ice index is derived using SSM/I data that is used to investigate the overall ratio of ice/liquid water change of the typhoon during its development. By comparing the ice/water ratio of different mesoscale convective cells in the typhoon, attempts are made to interpret the different cloud structures and development stages of individual mesoscale cloud cells relative to their position from the typhoon center. It is found that the atmospheric water budget in the typhoon is mainly balanced by horizontal transport of water vapor into the region, evaporation from the ocean and precipitation. Of the two source terms, horizontal transport plays the major role with a contribution of more than 65% in all storm stages for 1° radial area or larger. In addition, the horizontal transport of water vapor seems to occur through several “bands” instead of uniform convergence. Mesoscale convective cells, which may consist of several cumulonimbus clouds in each, develop in the bands, with convectively more active cells occurring upwind and the dissipating one downwind. It it also found that the maximum latent heat release precedes the maximum storm intensity.
    Type of Medium: Electronic Resource
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  • 9
    Publication Date: 2012-02-27
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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  • 10
    Publication Date: 2012-06-14
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
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