TY  - JOUR
A1  - Prasad, Sushma
A1  - Mishra, Praveen Kumar
A1  - Menzel, Philip
A1  - Gaye, Birgit
A1  - Jehangir, Arshid
A1  - Yousuf, Abdul R.
T1  - Testing the validity of productivity proxy indicators in high altitude Tso Moriri Lake, NW Himalaya (India)
JF  - Palaeogeography, palaeoclimatology, palaeoecology : an international journal for the geo-sciences
N2  - We use multiple proxies (delta C-13(org), delta N-15(org), C/N, amino acids, biogenic silica) from the catchment, lake surface and core sediments to (i) identify the factors influencing conventional lacustrine primary productivity (LPP) indicators (isotopic covariance, C/N) in the sediments from the pristine high altitude Tso Moriri Lake during the late Quaternary, (ii) compare C/N and bulk organic isotopic data from the core with available biogenic silica and amino acid data to test the applicability of conventional LPP indicators during the late Quaternary, and (iii) evaluate the degree of sensitivity of LPP to climate change. Our results show that climate driven changes in water salinity and source water changes have influenced the isotopic (delta C-13, delta N-15) content of the lake water and hence the isotopic composition of bulk organic matter. Erosion has also played a role in masking the LPP as the catchment sediments from this high altitude lake have low C/N thereby casting doubt on the effectiveness of this parameter as an LPP indicator. Independent LPP indicators in Tso Moriri sediments clearly indicate that it is driven by climate change and increases during warmer periods. However, our data show that the LPP in recent times is not much higher than during the early Holocene, ruling out any impact of recent warming on LPP and therefore the possibility of large carbon sequestration in high altitude oligotrophic lakes. (C) 2016 Elsevier B.V. All rights reserved.
KW  - Tso Moriri Lake
KW  - isotopes
KW  - lacustrine primary productivity (LPP)
KW  - Indian monsoon
KW  - late Quaternary
Y1  - 2016
U6  - https://doi.org/10.1016/j.palaeo.2016.02.027
SN  - 0031-0182
SN  - 1872-616X
VL  - 449
SP  - 421
EP  - 430
PB  - Elsevier
CY  - Amsterdam
ER  -