Energy and mass exchange and the productivity of main Siberian ecosystems (from Eddy covariance measurements). 1. heat balance structure over the vegetation season

Abstract

Direct measurements of heat balance (latent heat and sensible heat fluxes) by the eddy covariance method, undertaken in 1998-2000 and 2002-2004, are used to obtain information on the daily, seasonal, and annual dynamics of energy and mass exchange between the atmosphere and the typical ecosystems of Siberia (middle taiga pine forest, raised bog, and true four grass steppe with data for typical tundra) along the Yenisei meridian (90° E).

Energy and mass exchange and the productivity of main Siberian ecosystems (from Eddy covariance measurements). 2. carbon exchange and productivity

“…It is known that subboreal true steppes of Siberia act in a periodic mode depending on periodically changing environ mental factors when primary production is processed by heterotrophs over several years (Titlyanova and Tisarzhova, 1991); that is, they are weak carbon sinks.…”

“…This technique implies direct measurement of СО 2 exchange between terrestrial ecosystems and the atmosphere and makes it possible to study the depen dence of carbon balance in ecosystems on climate parameters, obtain the data for parameterization of energy and mass exchange (EME) processes in the models of different scales, and verify these models. The use of this method for measuring the heat balance components in typical ecosystems of Siberian zonal vegetation is considered in the first part of our paper (Tchebakova et al, 2015). In this part of the paper, we consider the following issues associated with СО 2 exchange and the produc tivity of background Central Siberian ecosystems for the same objects (middle taiga pine forest, raised bog, true steppe, typical tundra, and tussock tundra) taking into account the results of our analysis of direct EC measurements of СО 2 , water, and energy fluxes:…”

An investigation of temporal variability of CO2 fluxes in a boreal coniferous forest and a bog in central Siberia : from local to regional scale

“…3.1 bottom). Long-term energy and mass exchange measurements based on the EC technique in this region were performed quasi-continuously from 1998-2005Kelliher et al, 1999;Lloyd et al, 2002a;Tchebakova et al, 2015). A new flux tower (60 o 48'25''N, 89 o 21'27''E, 180 m a.s.l.)…”