Indian Ocean zonal mode activity in a multicentury integration of a coupled AOGCM consistent with climate proxy data

Details Indian Ocean zonal mode activity in a multicentury integration of a coupled AOGCM consistent with climate proxy data Indian Ocean zonal mode activity in a multicentury integration of a coupled AOGCM consistent with climate proxy data

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3318710m&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 18, CiteID L18710

Physics

7

Atmospheric Processes: Paleoclimatology (0473, 4900), Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Atmospheric Processes: Climate Change And Variability (1616, 1635, 3309, 4215, 4513), Atmospheric Processes: Global Climate Models (1626, 4928)

Scientific paper

The coupled atmosphere-ocean system over the Indian Ocean (termed Indian Ocean Zonal Mode, IOZM) and its activity over the past 200 years is analyzed in a paleoclimate simulation from a coupled atmosphere-ocean general circulation model (AOGCM). Validation shows that the AOGCM captures spatio-temporal patterns of sea surface temperature anomalies as well as the seasonal phase-locking feature of the IOZM. The period 1820-1880 exhibits a high frequency of climatically significant IOZM events, compared to a relatively low frequency in the 20th century. This shift in frequency provides a climate dynamics background for the interpretation of proxy data from East Africa, a region subjected to anomalously strong October-December precipitation during IOZM events. In the late 19th century, East African lakes had highstands (e.g., Lake Victoria) and its glaciers stable extents (e.g., Kilimanjaro), consistent with a wetter climate due to the higher frequency of IOZM events.

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