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Precipitable Water in Cloudy Area

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Publication Date
Disciplines
  • Earth Science
  • Geography

Abstract

Visiting scientist report within the SAF on climate monitoring Precipitable Water in Cloudy Area (VS Plan 7.7) Heike Hauschildt and Andreas Macke IFM–GEOMAR Leibniz Institut fu¨r Meereswissenschaften Du¨sternbrooker Weg 20 D–24105 Kiel Contents 1 Introduction 1 2 Data and Algorithms 3 2.1 AMSU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2.1.1 Microwave radiative transfer . . . . . . . . . . . . . . . . . . . . . . . . . . 4 2.2 AVHRR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Comparison of the two retrieval methods 11 4 LWP–WVP Relationships 15 4.1 Dependency on cloud cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 4.2 Global statistics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5 Conclusions 21 Bibliography . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 A List of Acronyms and Symbols 25 B Cloud Cover 27 C Frequency distributions 31 D Water Vapour Enhancement 33 Chapter 1 Introduction The spatial and temporal pattern of atmospheric water vapour describes the current state of our climate system. Water vapour affects the tropospheric temperature due to greenhouse warming stronger than other atmospheric gases. It is the mandatory condition for clouds and the hydrological cycle. The changes in cloud cover control the net warming/cooling processes. The range in estimated climate sensitivity of 1.5 to 4.5◦ C for a CO2 doubling is largely dictated by the interaction of model water vapour feedbacks with the variations in cloud behavior among existings models (IPCC Working Group I (2001)). To understand the role of water vapour in our climate system a realistic monitoring of global water vapour distributions, both horizontally and vertically, is required. Satellite remote sensing offers the possibility to retrieve the vertical structure of the atmosphere under cloud free condi

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