Does the Northeast Monsoon Variability is Forced by the Greenland Temperatures?

Strength of the Northeast Monsoon (NE), winter cooling intensity and associated productivity in the Northeast Arabian Sea are strongly coupled. Here we report the variability of NE monsoon and winter cooling over last 40 kyr by using seasonal sea surface temperature (SST), productivity indices of planktonic foraminifer species assemblages and oxygen and carbon isotope ratios in planktonic foraminifera. Lower annual, summer and winter SSTs during MIS 2 than in MIS1 and 3 are documented indicates strong winter cooling during MIS2. Lowest winter SST anomalies in the NE Arabian Sea coincides with cold stadials (H2, H1) of Greenland records reveals that NE monsoon was stronger during cold phases of Greenland. Thus, the cold temperatures in the Greenland would provide a positive feedback to the NE monsoon and negative feedback to the SW monsoon. Further, NE Monsoon and winter cooling exhibit 500years periodicity coincides with the periodicity of solar irradiance implies that the combination of two processes; 1.Total solar irradiance and 2. Boundary conditions in Siberia have a bearing on the strength of NE monsoon.