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| Titel |
Investigation of the "elevated heat pump" hypothesis of the Asian monsoon using satellite observations |
| VerfasserIn |
M. M. Wonsick, R. T. Pinker, Y. Ma |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 16 ; Nr. 14, no. 16 (2014-08-26), S.8749-8761 |
| Datensatznummer |
250118981
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| Publikation (Nr.) |
 copernicus.org/acp-14-8749-2014.pdf |
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| Zusammenfassung |
| The "elevated heat pump" (EHP) hypothesis has been a topic of intensive
research and controversy. It postulates that aerosol-induced anomalous mid-
and upper-tropospheric warming in the Himalayan foothills and above the
Tibetan Plateau leads to an early onset and intensification of Asian monsoon
rainfall. This finding is primarily based on results from a NASA
finite-volume general circulation model run with and without radiative
forcing from different types of aerosols. In particular, black carbon
emissions from sources in northern India and dust from Western China,
Afghanistan, Pakistan, the Thar Desert, and the Arabian Peninsula drive the
modeled anomalous heating. Since the initial discussion of the EHP hypothesis
in 2006, the aerosol–monsoon relationship has been investigated using
various modeling and observational techniques. The current study takes a
novel observational approach to detect signatures of the "elevated heat
pump" effect on convection, precipitation, and temperature for contrasting
aerosol content years during the period of 2000–2012. The analysis benefits
from unique high-resolution convection information inferred from Meteosat-5
observations as available through 2005. Additional data sources include
temperature data from the NCEP/NCAR Reanalysis and the European Reanalysis
(ERA-Interim) precipitation data from the Global Precipitation Climatology
Project (GPCP), aerosol optical depth from the Multi-angle Imaging
Spectroradiometer (MISR) and the Moderate Resolution Imaging
Spectroradiometer (MODIS), and aerosol optical properties from the Modern-Era
Retrospective Analysis for Research and Applications (MERRA) aerosol
reanalysis. Anomalous upper-tropospheric warming and the early onset and
intensification of the Indian monsoon were not consistently observed during
the years with high loads of absorbing aerosols. Possibly, model assumptions
and/or unaccounted semi-direct aerosol effects caused the disagreement
between observed and hypothesized behavior. |
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