Global climatology of Convective Available Potential Energy (CAPE) and Convective Inhibition (CIN) in ERA-40 reanalysis

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外文摘要：Convective Available Potential Energy (CAPE) and Convective Inhibition (CIN) play a dominant role in convective precipitation, its genesis and intensity. A global climatology of CAPE and CIN is presented in terms of seasonal means, variances, and trends based on 44 years (1958-2001) of six-hourly ERA-40 reanalysis (European Centre for Medium-Range Weather Forecast ECMWF, T106 resolution). CAPE shows large values and high variability in the tropics with maxima over the continents; the seasonal changes are dominated by specific humidity. CIN shows large means and variability in the subtropics. Significant trends in CAPE and CIN give the following results: (ⅰ) In general, a CAPE increase is noted during all seasons while, in particular, in autumn CIN shows a decrease over continents, (ⅱ) Splitting of the time series reveals a sign change in trend commencing at the end of the 70s; this is observed in parts of the tropical continents and North America. CAPE and CIN show trends of opposite sign with CAPE increasing in the first half and a decrease during the second half (and vice versa for CIN).

外文关键词：

CAPECINERA-40trend analysis

作者：

Kathrin Riemann-Campe、Klaus Fraedrich、Frank Lunkeit

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作者单位：

Meteorologisches lnstitut der Universitaet Hamburg, Grindelberg 5, D-20144 Hamburg, Germany International Max Planck Research School on Earth System Modelling, Bundesstrasse 53, D-20146 Hamburg, Germany

Meteorologisches lnstitut der Universitaet Hamburg, Grindelberg 5, D-20144 Hamburg, Germany

出版年：

2009

Atmospheric research

EIISTP

ISSN：0169-8095

年,卷(期)：2009.93(1/3)