Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai–Tibetan Plateau

Gu, Song; Tang, Yanhong; Cui, Xiaoyong; Kato, Tomomichi; Du, Mingyuan; Li, Yingnian; Zhao, Xinquan

doi:10.1016/j.agrformet.2004.12.002

Cited by 128 publications

(94 citation statements)

References 17 publications

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“…This observation is in agreement with, e.g. Gu et al (2005) and Ma and Ma (2006). The mean diurnal cycles of surface and air temperature also show the typical dynamics above land surface, with unstable stratification during daytime but higher surface temperatures are observed over grass − .…”

Section: Flux Measurementssupporting

confidence: 79%

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Biermann

Babel

et al. 2013

Theor Appl Climatol

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The Tibetan Plateau plays an important role in the global water cycle and is strongly influenced by climate change. While energy and matter fluxes have been more intensely studied over land surfaces, a large proportion of lakes have either been neglected or parameterised with simple bulk approaches. Therefore, turbulent fluxes were measured over wet grassland and a shallow lake with a single eddy-covariance complex at the shoreline in the Nam Co basin in summer 2009. Footprint analysis was used to split observations according to the underlying surface, and two sophisticated surface models were utilised to derive gap-free time series. Results were then compared with observations and simulations from a nearby eddy-covariance station over dry grassland, yielding pronounced differences. Observations and footprint integrated simulations compared well, even for situations with flux contributions including grassland and lake. The accessibility problem for EC measurements on lakes can be overcome by combining standard meteorological measurements at the shoreline with model simulations, only requiring representative estimates of lake surface temperature.

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Section: Flux Measurementssupporting

confidence: 79%

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Biermann

Babel

et al. 2013

Theor Appl Climatol

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“…Some studies hypothesized that amplitude of diurnal temperature (ADT, defined as the difference of daytime and nocturnal air temperature) favors alpine C sequestration (Gu et al 2005, Zhao et al 2006). We found negative linear relationships between monthly photosynthetic characteristics and ADT (r 2 >0.11, p<0.01).…”

Section: Discussionmentioning

confidence: 99%

Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China

Zhang

et al. 2014

Photosynt.

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Ecosystem photosynthetic characteristics are of utmost importance for the estimation of regional carbon budget, but such characteristics are not well understood in alpine regions. We collected CO 2 flux data measured by eddy covariance technique over an alpine dwarf shrubland on the Qinghai-Tibetan Plateau during years 2003-2010; and we quantified the temporal patterns of ecosystem apparent quantum yield (a), saturated photosynthetic rate (P max ), and ecosystem dark respiration (R De ). Results showed that the strong seasonality of a and R De was driven mainly by air temperature (T a ), whereas that of P max was much more determined by leaf area index rather than abiotic factors. Diurnal thermal fluctuation inhibited significantly the daytime photosynthetic capacity. Stepwise regression revealed that the seasonal deviations of a, P max , and R De were significantly controlled by T a . The annual a was regulated mainly by annual growing season T a , which indicated that the response of ecosystem a was instant. The annual variations of P max correlated positively with soil temperature 5 cm below ground (T s ) of the annual nongrowing season and those of R De related negatively with the annual nongrowing season precipitation. We suggested that a lagged response regulated the annual P max and the annual R De . Annual deviations of a and R De were both significantly controlled by annual T s , and those of P max were marginally determined by annual PPFD. Thus, the future warming scenario, especially significant for nongrowing seasonal warming in the Qinghai-Tibetan Plateau, would favor ecosystem photosynthetic capacity in the alpine dwarf shrubland.Additional key words: ecosystem photosynthetic parameters; eddy covariance technique; leaf area index; phenology; rectangular hyperbolic light response.

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“…Previous research has investigated the diurnal, seasonal and annual variation of the SEB at stations over various land cover types in the TP, including grassland (Y. Ma et al, 2003;Tanaka et al, 2003;Liu et al, 2009;Bian et al, 2012), meadow (Gu et al, 2005;Yao et al, 2008Yao et al, , 2011, and glacial and alpine areas (Zou et al, 2009;Yang et al, 2011c;Chen et al, 2012;Zhang et al, 2013). Advanced methods have been developed to retrieve SEB from improved parameterization of routine meteorological observations (Yang et al, 2002(Yang et al, , 2003Chen et al, 2010Chen et al, , 2013bGuo et al, 2011b;Lee et al, 2012) satellite observations (Y.…”

Section: Q Shi and S Liang: Surface Sensible And Latent Heat Fluxesmentioning

confidence: 99%

Surface-sensible and latent heat fluxes over the Tibetan Plateau from ground measurements, reanalysis, and satellite data

Shi

Liang

2014

Atmos. Chem. Phys.

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Abstract. Estimations from meteorological stations over the Tibetan Plateau (TP) indicate that since the 1980s the surface-sensible heat flux has been decreasing continuously, and modeling studies suggest that such changes are likely linked to the weakening of the East Asian Monsoon through exciting Rossby wave trains. However, the spatial and temporal variations in the surface-sensible and latent heat fluxes over the entire TP remain unknown. This study aims to characterize the spatial and seasonal variability of the surfacesensible and latent heat fluxes at 0.5 • over the TP from 1984 to 2007 by synthesizing multiple data sources including ground measurements, reanalysis products, and remotesensing products. The root mean square errors (RMSEs) from cross validation are 14.3 Wm −2 and 10.3 Wm −2 for the monthly fused sensible and latent heat fluxes, respectively. The fused sensible and latent heat-flux anomalies are consistent with those estimated from meteorological stations, and the uncertainties of the fused data are also discussed. The associations among the fused sensible and latent heat fluxes and the related surface anomalies such as mean temperature, temperature range, snow cover, and normalized difference vegetation index (NDVI) in addition to atmospheric anomalies such as cloud cover and water vapor show seasonal dependence, suggest that the land-biosphere-atmosphere interactions over the TP could display nonuniform feedbacks to the climate changes. It would be interesting to disentangle the drivers and responses of the surface-sensible and latent heat-flux anomalies over the TP in future research from evidences of modeling results.

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Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai–Tibetan Plateau

Cited by 128 publications

References 17 publications

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Turbulent flux observations and modelling over a shallow lake and a wet grassland in the Nam Co basin, Tibetan Plateau

Seasonal and interannual variations of ecosystem photosynthetic features in an alpine dwarf shrubland on the Qinghai-Tibetan Plateau, China

Surface-sensible and latent heat fluxes over the Tibetan Plateau from ground measurements, reanalysis, and satellite data

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