TY  - JOUR
A1  - Basavaiah, Nathani
A1  - Wiesner, M. G.
A1  - Anoop, Ambili
A1  - Menzel, P.
A1  - Nowaczyk, Norbert R.
A1  - Deenadayalan, K.
A1  - Brauer, Achim
A1  - Gaye, Birgit
A1  - Naumann, R.
A1  - Riedel, N.
A1  - Stebich, M.
A1  - Prasad, Sushma
T1  - Physicochemical analyses of surface sediments from the Lonar Lake, central India - implications for palaeoenvironmental reconstruction
JF  - Fundamental and applied limnology : official journal of the International Association of Theoretical and Applied Limnology
N2  - We report the results of our investigations on the catchment area, surface sediments, and hydrology of the monsoonal Lonar Lake, central India. Our results indicate that the lake is currently stratified with an anoxic bottom layer, and there is a spatial heterogeneity in the sensitivity of sediment parameters to different environmental processes. In the shallow (0-5 m) near shore oxic-suboxic environments the lithogenic and terrestrial organic content is high and spatially variable, and the organics show degradation in the oxic part. Due to aerial exposure resulting from lake level changes of at least 3m, the evaporitic carbonates are not completely preserved. In the deep water (>5 m) anoxic environment the lithogenics are uniformly distributed and the delta C-13 is an indicator not only for aquatic vs. terrestrial plants but also of lake pH and salinity. The isotopic composition of the evaporites is dependent not only on the isotopic composition of source water (monsoon rainfall and stream inflow) and evaporation, but is also influenced by proximity to the isotopically depleted stream inflow. We conclude that in the deep water environment lithogenic content, and isotopic composition of organic matter can be used for palaeoenvironmental reconstruction.
KW  - isotopes
KW  - lonar lake
KW  - modern surface sediments
KW  - magnetic parameters
KW  - monsoon
KW  - palaeoenvironmental proxies
Y1  - 2014
U6  - https://doi.org/10.1127/1863-9135/2014/0515
SN  - 1863-9135
VL  - 184
IS  - 1
SP  - 51
EP  - 68
PB  - Schweizerbart
CY  - Stuttgart
ER  - 
TY  - JOUR
A1  - Prasad, Sushma
A1  - Anoop, A.
A1  - Riedel, N.
A1  - Sarkar, Saswati
A1  - Menzel, P.
A1  - Basavaiah, Nathani
A1  - Krishnan, R.
A1  - Fuller, D.
A1  - Plessen, Birgit
A1  - Gaye, B.
A1  - Roehl, U.
A1  - Wilkes, H.
A1  - Sachse, Dirk
A1  - Sawant, R.
A1  - Wiesner, M. G.
A1  - Stebich, M.
T1  - Prolonged monsoon droughts and links to Indo-Pacific warm pool: A Holocene record from Lonar Lake, central India
JF  - Earth & planetary science letters
N2  - Concerns about the regional impact of global climate change in a warming scenario have highlighted the gaps in our understanding of the Indian Summer Monsoon (ISM, also referred to as the Indian Ocean summer monsoon) and the absence of long term palaeoclimate data from the central Indian core monsoon zone (CMZ). Here we present the first high resolution, well-dated, multiproxy reconstruction of Holocene palaeoclimate from a 10 m long sediment core raised from the Lonar Lake in central India. We show that while the early Holocene onset of-intensified monsoon in the CMZ is similar to that reported from other ISM records, the Lonar data shows two prolonged droughts (PD, multidecadal to centennial periods of weaker monsoon) between 4.6-3.9 and 2-0.6 cal ka. A comparison of our record with available data from other ISM influenced sites shows that the impact of these PD was observed in varying degrees throughout the ISM realm and coincides with intervals of higher solar irradiance. We demonstrate that (i) the regional warming in the Indo-Pacific Warm Pool (IPWP) plays an important role in causing ISM PD through changes in meridional overturning circulation and position of the anomalous Walker cell; (ii) the long term influence of conditions like El Nino-Southern Oscillation (ENSO) on the ISM began only ca. 2 cal ka BP and is coincident with the warming of the southern IPWP; (iii) the first settlements in central India coincided with the onset of the first PD and agricultural populations flourished between the two PD, highlighting the significance of natural climate variability and PD as major environmental factors affecting human settlements.
KW  - Indian summer monsoon
KW  - ENSO
KW  - prolonged droughts
KW  - Holocene
KW  - Lonar Lake
Y1  - 2014
U6  - https://doi.org/10.1016/j.epsl.2014.01.043
SN  - 0012-821X
SN  - 1385-013X
VL  - 391
SP  - 171
EP  - 182
PB  - Elsevier
CY  - Amsterdam
ER  -