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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 22 | Copyright
Biogeosciences, 12, 6655-6667, 2015
https://doi.org/10.5194/bg-12-6655-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 24 Nov 2015

Research article | 24 Nov 2015

Response of CO2 and H2O fluxes in a mountainous tropical rainforest in equatorial Indonesia to El Niño events

A. Olchev1,2, A. Ibrom3, O. Panferov4, D. Gushchina5, H. Kreilein2, V. Popov6,7, P. Propastin2, T. June8, A. Rauf9, G. Gravenhorst*, and A. Knohl2 A. Olchev et al.
  • 1A.N. Severtsov Institute of Ecology and Evolution of RAS, Moscow, Russia
  • 2Department of Bioclimatology, Faculty of Forest Sciences and Forest Ecology, Georg August University of Goettingen, Goettingen, Germany
  • 3Department for Environmental Engineering, Technical University of Denmark, Kgs. Lyngby, Denmark
  • 4Climatology and Climate Protection, Faculty of Life Sciences and Engineering, University of Applied Sciences, Bingen am Rhein, Germany
  • 5Department of Meteorology and Climatology, Faculty of Geography, Moscow State University, Moscow, Russia
  • 6Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia
  • 7Financial University under the Government of the Russian Federation, Moscow, Russia
  • 8Bogor Agricultural University, Department of Geophysics and Meteorology, Bogor, Indonesia
  • 9Universitas Tadulako, Palu, Indonesia
  • *retired

Abstract. The possible impact of El Niño–Southern Oscillation (ENSO) events on the main components of CO2 and H2O fluxes between the tropical rainforest and the atmosphere is investigated. The fluxes were continuously measured in an old-growth mountainous tropical rainforest in Central Sulawesi in Indonesia using the eddy covariance method for the period from January 2004 to June 2008. During this period, two episodes of El Niño and one episode of La Niña were observed. All these ENSO episodes had moderate intensity and were of the central Pacific type. The temporal variability analysis of the main meteorological parameters and components of CO2 and H2O exchange showed a high sensitivity of evapotranspiration (ET) and gross primary production (GPP) of the tropical rainforest to meteorological variations caused by both El Niño and La Niña episodes. Incoming solar radiation is the main governing factor that is responsible for ET and GPP variability. Ecosystem respiration (RE) dynamics depend mainly on the air temperature changes and are almost insensitive to ENSO. Changes in precipitation due to moderate ENSO events did not have any notable effect on ET and GPP, mainly because of sufficient soil moisture conditions even in periods of an anomalous reduction in precipitation in the region.

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The time series analysis of the main meteorological parameters and components of CO2 and H2O fluxes showed a high evapotranspiration (ET) and gross primary production (GPP) sensitivity of the tropical rainforest to meteorological variations caused by El Niño-Southern Oscillation (ENSO) events. Incoming solar radiation is the main governing factor that is responsible for ET and GPP variability. Changes in precipitation due to moderate ENSO events did not have any notable effect on ET and GPP.
The time series analysis of the main meteorological parameters and components of CO2 and H2O...
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