World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Dependence of Cloud Fraction and Cloud Top Height on Surface Temperature Derived from Spectrally Resolved Uv/Vis Satellite Observations : Volume 7, Issue 6 (23/11/2007)

By Wagner, T.

Click here to view

Book Id: WPLBN0003997831
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Dependence of Cloud Fraction and Cloud Top Height on Surface Temperature Derived from Spectrally Resolved Uv/Vis Satellite Observations : Volume 7, Issue 6 (23/11/2007)  
Author: Wagner, T.
Volume: Vol. 7, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Historic
Publication Date:
2007
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Deutschmann, T., Beirle, S., Grzegorski, M., Wagner, T., & Platt, U. (2007). Dependence of Cloud Fraction and Cloud Top Height on Surface Temperature Derived from Spectrally Resolved Uv/Vis Satellite Observations : Volume 7, Issue 6 (23/11/2007). Retrieved from http://worldlibrary.in/


Description
Description: MPI for Chemistry, Mainz, Germany. Cloud climate feedback constitutes the most important uncertainty in climate modelling, and currently even its sign is still unknown. In the recently published report of the intergovernmental panel on climate change (IPCC), from 20 climate models 6 showed a positive and 14 a negative cloud radiative feedback in a doubled CO2 scenario. The radiative budget of clouds has also been investigated by experimental methods, especially by studying the relation of satellite observed broad band shortwave and longwave radiation to sea surface temperature. Here we present a new method for the investigation of the dependence of cloud properties on temperature changes, derived from spectrally resolved UV/vis satellite observations. Our study differs from previous investigations in three important ways: first, we directly extract cloud properties (amount and altitude) and relate them to surface temperature. Second, we retrieve the cloud altitude from the atmospheric O2 absorption instead from thermal IR radiation. Third, our correlation analysis is performed using 7.5 years of global monthly anomalies (with respect to the average of the same month for all years). For most parts of the globe (except the tropics) we find a negative correlation of cloud fraction versus surface-near temperature. In contrast, for the cloud top height a positive correlation is found for almost the whole globe. Both findings might serve as an indicator for an overall positive cloud climate feedback. Another peculiarity of our study is that the cloud-temperature relationships are determined for fixed locations (instead to spatial variations over selected areas) and are based on the natural variability over several years (instead the anomaly for a strong El-Nino event). Thus our results might be especially representative for the extrapolation to long term climate changes. Climate models should aim to reproduce our findings: if substantial differences are found, this might indicate that important details are not yet well captured by these models. If good agreement is found, from the models reliable information on the magnitude and the detail mechanisms of cloud climate feedback could be gained.

Summary
Dependence of cloud fraction and cloud top height on surface temperature derived from spectrally resolved UV/vis satellite observations

Excerpt
Bergman, J. W. and Salby, M. L.: Diurnal variations of cloud cover and their relationship to climatological conditions, J. Climate, 9, 2802–2820, 1996.; Bony, S., Lau, K.-M., and Sud, Y. C.: Sea surface temperature and large-scale circulation influences on tropical greenhouse effect and cloud radiative forcing, J. Climate, 2055–2077, 1997a.; Bony, S., Sud, Y., Lau, K.-M., Susskind, J., and Saha, S.: Comparison and assessment of NASA/DAO and NCEP-NCAR reanalyses over tropical oceans: atmospheric hydrology and radiation, J. Climate, 1441–1462, 1997b.; Bony, S. and Dufresne, J.-L.: Marine boundary layer clouds at the heart of tropical cloud feedback uncertainties in climate models, Geophys. Res. Lett., 32, L20806, doi:10.1029/2005GL023851, 2005.; Burrows, J. P., Weber, M., Buchwitz, M., Rozanov, V., Ladstätter-Weißenmayer, A., Richter, A., DeBeek, R., Hoogen, R., Bramstedt, K., Eichmann, K.-U., Eisinger, M., and Perner, D.: The Global Ozone Monitoring Experiment (GOME): Mission Concept and First Scientific Results, J. Atmos. Sci., 56, 151–175, 1999.; Cess, R., Potter, G. L., Blanchet, J. P., et al.: Intercomparison and interpretation of cloud-climate feedback processes in nineteen atmospheric general circulation models, J. Geophys. Res., 95, 16 601–16 615, 1990.; Cess, R. D. Kwon, T. Y., Harrison, E. F., et al.: Interpretation of seasonal cloud-climate interactions using Earth Radiation Budget Experiment data, J. Geophys. Res., 97, 7613–7617, 1992.; Cess, R. D., Zhang, M. H., Ingram, W. J., Potter, G. L., Alekseev, V., Barker, H. W., Cohen-Solal, E., Colman, R. A., Dazlich, D. A., Del Genio, A. D., Dix, M. R., Dymnikov, V., Esch, M., Fowler, L. D., Fraser, J. R., Galin, V., Gates, W. L., Hack, J. J., Kiehl, J. T., Treut, H. L., Lo, K. K. W., McAvaney, B. J., Meleshko, V. P., Morcrette, J. J., Randall, D. A., Roeckner, E., Royer, J. F., Schlesinger, M. E., Sporyshev, P. V., Timbal, B., Volodin, E. M., Taylor, K. E., Wang, W., and Wetherald, R. T.: Cloud feedback in atmospheric general circulation models: An update, J. Geophys. Res., 101, 12 791–12 794, 1996.; Cess, R. D. and Udelhofen, P. M.: Climate change during 1985–1999: Cloud interactions determined from satellite measurements, Geophys. Res. Lett., 30, 1019, doi:10.1029/2002GL016128, 2003.; Deutschmann, T. and Wagner, T.: TRACY-II Users manual, University of Heidelberg (http://satellite.iup.uni-heidelberg.de/~tdeutsch/manual.pdf), 2006.; Fu, Q., Baker, M., and Hartmann, D. L.: Tropical cirrus and water vapor: an effective infrared iris feedback?, Atmos. Chem. Phys., 2, 31–37, 2002.; Grzegorski, M., Wenig, M., Platt, U., Stammes, P., Fournier, N., and Wagner, T.: The Heidelberg iterative cloud retrieval utilities (HICRU) and its application to GOME data, Atmos. Chem. Phys., 6, 4461–4476, 2006.; Hansen, J., Ruedy, R., Sato, M., Imhoff, M., Lawrence, W., Easterling, D., Peterson, T., and Karl, T.: A closer look at United States and global surface temperature change, J. Geophys. Res., 106, 23 947–23 963, 2001.; Hartmann, D. L., Moy, L. A., and Fu, Q.: Tropical convection and the energy balance at the top of the atmosphere, J. Climate, 14, 4495–4511, 2001.; Harrison, E., Minnis, F. P., and Barkstrom, B. R.: Seasonal variations of cloud radiative forcing derived from the Earth's Radiation Budget Experiment, J. Geophys. Res., 95, 18 687–18 703, 1990.; Koelemeijer, R. B. A., de Haan, J. F., and Stammes, P.: A database of spectral surface reflectivity in the range 335–772 nm derived from 5.5~years of GOME observations, J. Geophys. Res., 108, 4070, doi:10.1029/2002JD002429, 2003.; Kubar, T. L., Hartmann, D. L., and Wood, R.: Radiative and convective driving of tropical high clouds, J. Climate, in press, 2007.; Larson, K. and Hartmann, D. L.: Interactions among cloud, water vapor, radiation, and large-scale circulation in the tropical climate, part

 

Click To View

Additional Books


  • Temporal and Spatial Scaling Impacts on ... (by )
  • Climatological Aspects of Aerosol Optica... (by )
  • Chemical Characterization of the Inorgan... (by )
  • Investigation of Post-depositional Proce... (by )
  • Mixing Processes and Exchanges in the Tr... (by )
  • Mixing State of Carbonaceous Aerosol in ... (by )
  • Iodine-mediated Coastal Particle Formati... (by )
  • Interannual Variability of Long-range Tr... (by )
  • Gas/Particle Partitioning of Water-solub... (by )
  • Long-term Aerosol-mediated Changes in Cl... (by )
  • Laboratory Studies of Collection Efficie... (by )
  • Impact of Different Definitions of Clear... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from World Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.