The May?October energy budget of a Scots pine plantation at Hartheim, Germany

Gay, Lloyd W.; Vogt, Roland; Kessler, Albrecht

doi:10.1007/bf00866413

Cited by 17 publications

(2 citation statements)

References 16 publications

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“…2, annual mean actual evapotranspiration E is the annual mean potential evapotranspiration reduced by ε (Eqns 8 and 9). This simple picture tends to underestimate the effects of limited water availability on the reduction of latent heat fluxes, because observations often indicate not only a stagnation but a significant reduction of latent heat flux due to stomatal closure under limited soil water conditions (Jarvis & McNaughton, 1986;Gay et al, 1996).…”

Section: Surface Fluxes and Energy Balancesupporting

confidence: 60%

On the role of dynamic atmosphere–vegetation interactions under increasing radiative forcing

Füssler

Gassmann

2000

Global Ecology and Biogeography

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A zero‐dimensional model of local atmosphere–vegetation interaction is presented. The model includes essentials of water related two‐way feedbacks, such as the influence of vegetation on evapotranspiration, and the impact of temperature and drought on biomass growth and mortality. The simple model serves as a framework for the preliminary investigation of vegetation related feedbacks under climate change scenarios.

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Section: Surface Fluxes and Energy Balancesupporting

confidence: 60%

On the role of dynamic atmosphere–vegetation interactions under increasing radiative forcing

Füssler

Gassmann

2000

Global Ecology and Biogeography

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“…Therefore, we also tested air temperature measured just above the canopy (at 30 m TH, RE, NO; at 24 m WS) as a proxy for biomass temperature (e.g. Gay et al 1996). A careful estimation of wet biomass is indicated because this parameter can easily change the magnitude of J veg (Eq.…”

Section: Biomass Heat Storage Change J Vegmentioning

confidence: 99%

Available energy and energy balance closure at four coniferous forest sites across Europe

Moderow

Aubinet

Feigenwinter

et al. 2009

Theor Appl Climatol

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The available energy (AE), driving the turbulent fluxes of sensible heat and latent heat at the earth surface, was estimated at four partly complex coniferous forest sites across Europe (Tharandt, Germany; Ritten/Renon, Italy; Wetzstein, Germany; Norunda, Sweden). Existing data of net radiation were used as well as storage change rates calculated from temperature and humidity measurements to finally calculate the AE of all forest sites with uncertainty bounds. Data of the advection experiments MORE II (Tharandt) and ADVEX (Renon, Wetzstein, Norunda) served as the main basis. On-site data for referencing and cross-checking of the available energy were limited. Applied cross checks for net radiation (modelling, referencing to nearby stations and ratio of net radiation to global radiation) did not reveal relevant uncertainties. Heat storage of sensible heat J H , latent heat J E , heat storage of biomass J veg and heat storage due to photosynthesis J C were of minor importance during day but of some importance during night, where J veg turned out to be the most important one. Comparisons of calculated storage terms (J E , J H ) at different towers of one site showed good agreement indicating that storage change calculated at a single point is representative for the whole canopy at sites with moderate heterogeneity. The uncertainty in AE was assessed on the basis of literature values and the results of the applied cross checks for net radiation. The absolute mean uncertainty of AE was estimated to be between 41 and 52 W m −2 (10-11 W m −2 for the sum of the storage terms J and soil heat flux G) during mid-day (approximately 12% of AE). At night, the absolute mean uncertainty of AE varied from 20 to about 30 W m −2 (approximately 6 W m −2 for J plus G) resulting in large relative uncertainties as AE itself is small. An inspection of the energy balance showed an improvement of closure when storage terms were included and that the imbalance cannot be attributed to the uncertainties in AE alone.

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The HartX period May 1992, seen against the background of twenty years of energy balance climatology at the Hartheim pine plantation

Jaeger¹,

Kessler²

1996

Theor Appl Climatol

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SummaryThe experimental site of the Department of Meteorology of Freiburg University at the Hartheim pine stand is first described. There, since 1973 long term measurements of net radiation and its components have been carried out. In addition we have been monitoring the different heat fluxes and components of the forest water budget.From May 1 1 th to May 24th 1992 a special international and interdisciplinary observation period was organized in Hartheim (HartX 92). This took place in the frame of the international regional climatic project REKLIP (Regionales Klima Projekt). We then describe the permanent equipment and the special HartX installations. After that we show the climate of the region, in May 1992 and the weather during the HartX period. It was extraordinarily warm and the precipitation was much less than normal. The cloud cover was very small.We report the results of the radiation measurements (net radiation and its components). They are compared to the long standing measurements (1974)(1975)(1976)(1977)(1978)(1979)(1980)(1981)(1982)(1983)(1984)(1985)(1986)(1987)(1988). Moreover the longstanding data of the components of the water budget (throughfall, canopy drip and stemflow, interception and transpiration) of the period 1978-1985 are dealt with. In addition we report the behaviour of the energy fluxes (soil-stand heat flux, turbulent sensible and latent heat fluxes) of the period 1974-1988. These estimations are compared to the conditions in May 1992 and the conditions during HartX 92.

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The May?October energy budget of a Scots pine plantation at Hartheim, Germany

Cited by 17 publications

References 16 publications

On the role of dynamic atmosphere–vegetation interactions under increasing radiative forcing

On the role of dynamic atmosphere–vegetation interactions under increasing radiative forcing

Available energy and energy balance closure at four coniferous forest sites across Europe

The HartX period May 1992, seen against the background of twenty years of energy balance climatology at the Hartheim pine plantation

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