Effect of various types of ENSO events on moisture conditions in the humid and sub-humid tropics

Gushchina, D.; Zheleznova, I.; Osipov, A.; Olchev, A.

Авторы: Gushchina D., Zheleznova I., Osipov A., Olchev A.
Журнал: Atmosphere
Том: 11
Номер: 12
Год издания: 2020
Издательство: MDPI
Местоположение издательства: Basel, Switzerland
Номер статьи: 1354
DOI: 10.3390/atmos11121354
Аннотация: Moisture anomaly conditions within humid and sub-humid tropics associated with different types of El Niño and La Niña phenomena are described and analyzed with a focus on their spatial distribution and seasonal variability. Five dryness indices (Keetch–Byram drought index, Weighted Anomaly Standardized Precipitation index, Standardized Precipitation Index, Palmer Drought Severity Index and Percent of normal precipitations) were derived from ERA5 reanalysis and UCAR data sets for the period from 1979 to 2019. Cross-correlation analysis was used to evaluate the relationships between ENSO and selected dryness indices. To describe the seasonal variability of the ENSO - surface moisture relationships the composite maps of dryness indices in different seasons were analyzed. The results showed significant heterogeneity of ENSO induced moisture anomaly conditions both within and across various geographical regions. Four main areas in humid and sub-humid tropics with maximum effects of El Niño/La Niña events on the surface moisture conditions were found: South-East Asia and Australia, Eastern and South Africa, North-Eastern and Eastern South America and Central America. It was shown that the effects of La Niña were usually opposite to those of El Niño, while responses to the two types of El Niño differed mostly in moisture anomaly intensity and its spatial patterns.
Добавил в систему: Ольчев Александр Валентинович

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Effect of various types of ENSO events on moisture conditions in the humid and sub-humid tropicsстатья