the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
The ENSO teleconnections to the Indian summer monsoon climate through the Last Millennium as simulated by the PMIP3
Charan Teja Tejavath
Karumuri Ashok
Supriyo Chakraborty
Rengaswamy Ramesh
Abstract. Using seven model simulations from the PMIP3, we study the mean summer (June–September) climate and its variability in India during the Last Millennium (LM; CE 850–1849) with emphasis on the Medieval Warm Period (MWP) and Little Ice Age (LIA), after validation of the simulated current day
climate and trends.
We find that the above (below) LM-mean summer global temperatures during the MWP (LIA) are associated with relatively higher (lower) number of concurrent El Niños as compared to La Niñas. The models simulate higher (lower) Indian summer monsoon rainfall (ISMR) during the MWP (LIA). This is notwithstanding a strong simulated negative correlation between the timeseries of NINO3.4 index and that of the area-averaged ISMR, Interestingly, the percentage of strong El Niños (La Niñas) causing negative (positive) ISMR anomalies is higher in the LIA (MWP), a non-linearity that apparently is important for causing higher ISMR in the MWP. Distribution of simulated boreal summer velocity potential at 850 hPa during MWP in models, in general, shows a zone of anomalous convergence in the central tropical Pacific flanked by two zones of divergence, suggesting a westward shift in the Walker circulation as compared to the simulations for LM as well as and a majority of historical simulations, and current day observed signal. The anomalous divergence centre in the west also extends into the equatorial eastern Indian Ocean, resulting in an anomalous convergence zone over India and therefore excess rainfall during the MWP as compared to the LM; the results are qualitative, given the inter-model spread.
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Charan Teja Tejavath et al.


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RC1: 'Review of cp-2018-7', Oliver Bothe, 01 Mar 2018
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AC1: 'Responses to Reviewer 1 (Oliver Bothe)', Karumuri Ashok, 11 May 2018
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AC1: 'Responses to Reviewer 1 (Oliver Bothe)', Karumuri Ashok, 11 May 2018
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RC2: 'Review Tejvath Climate Past', Anonymous Referee #2, 23 Apr 2018
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AC2: 'Responses to Reviewer 2 (Anonymous Reviewer)', Karumuri Ashok, 11 May 2018
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AC2: 'Responses to Reviewer 2 (Anonymous Reviewer)', Karumuri Ashok, 11 May 2018


-
RC1: 'Review of cp-2018-7', Oliver Bothe, 01 Mar 2018
-
AC1: 'Responses to Reviewer 1 (Oliver Bothe)', Karumuri Ashok, 11 May 2018
-
AC1: 'Responses to Reviewer 1 (Oliver Bothe)', Karumuri Ashok, 11 May 2018
-
RC2: 'Review Tejvath Climate Past', Anonymous Referee #2, 23 Apr 2018
-
AC2: 'Responses to Reviewer 2 (Anonymous Reviewer)', Karumuri Ashok, 11 May 2018
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AC2: 'Responses to Reviewer 2 (Anonymous Reviewer)', Karumuri Ashok, 11 May 2018
Charan Teja Tejavath et al.
Charan Teja Tejavath et al.
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