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Increased Eurasian‐tropical temperature amplitude difference in recent centuries: Implications for the Asian monsoon
Author(s) -
D'Arrigo Rosanne,
Wilson Rob,
Li Jinbao
Publication year - 2006
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2006gl027507
Subject(s) - tropics , climatology , monsoon , east asian monsoon , sea surface temperature , tropical monsoon climate , precipitation , monsoon of south asia , pacific decadal oscillation , geology , environmental science , atmospheric sciences , oceanography , geography , meteorology , fishery , biology
A warmer Eurasian continent and stronger land/sea temperature gradient between Eurasia and the tropical oceans contribute to an intensified summer monsoon. We evaluate changes in the temperature difference between Eurasia and the tropics over 250 years using proxies of Eurasian surface air temperatures (tree rings) and tropical sea surface temperatures (Indo‐Pacific corals). These records show low‐frequency correspondence with each other over this interval, and with other temperature and precipitation‐sensitive proxies from the Asian monsoon regime. Greater warming is estimated for Eurasia (amplitude = 1.70 ± 0.28°C; 1801–20 vs 1976–95) relative to the tropics (0.61 ± 0.29°C; 1806–25 vs 1937–56). The amplitude change from the 18th to 20th centuries is thus estimated to be about three times (1.5–6) greater over Eurasia than the tropics. This change may have contributed to an intensified Asian monsoon system over recent centuries, and to a decoupling of the monsoon and El Niño‐Southern Oscillation in recent decades.