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\begin{document}

\title{Winter daytime warming and shift in summer monsoon increase plant cover
and net CO2 uptake in a central Tibetan alpine steppe ecosystem}



\author[1]{Felix Nieberding}%
\author[2]{Christian Wille}%
\author[3]{Yaoming Ma}%
\author[3]{Yuyang Wang}%
\author[4]{Philipp Maurischat}%
\author[5]{Lukas Lehnert}%
\author[6]{Torsten Sachs}%
\affil[1]{Technische Universität Braunschweig}%
\affil[2]{Deutsches Geoforschungszentrum Potsdam}%
\affil[3]{Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research, Chinese Academy of Sciences}%
\affil[4]{Institute of Soil Science, Leibniz Universität Hannover}%
\affil[5]{Department of Geography}%
\affil[6]{GFZ German Research Centre for Geosciences}%


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  \date{May 17, 2024}


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\begin{abstract}
Over the past decades, human-induced climate change has led to a
widespread wetting and warming of the Tibetan Plateau, affecting both
ecosystems and the carbon cycling therein. Whether the observed climate
changes stimulate carbon uptake via enhanced photosynthesis or carbon
loss via enhanced soil respiration remains unclear. Here we present long
term observations of carbon fluxes, meteorological variables and
remotely sensed plant cover estimations from a central Tibetan alpine
steppe ecosystem at Nam Co, the third largest lake on the Tibetan
Plateau. Using modified Mann-Kendall trend tests, we found a significant
increasing daily net carbon uptake of 0.5 g C m-2 decade-1, which can be
explained by a widespread greening at the southern shore of lake Nam Co.
The Plateau-wide changes in temperature and precipitation are locally
expressed as an increasing diurnal temperature range during winter,
higher water availability during spring, higher cloud cover during early
summer and less water availability during late summer. While these
changes differ over the course of the year, they tend to stimulate plant
growth more than microbial respiration, leading to an increased carbon
uptake during all seasons. This study indicates that during the 14 years
study period, a higher amplitude in winter temperatures and an earlier
summer monsoon promote carbon uptake in a central Tibetan alpine steppe
ecosystem.%
\end{abstract}%



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