Indirect and direct effects of wetlands on climate in terms of thermodynamics of life

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F25173154%3A_____%2F15%3A%230000427" target="_blank" >RIV/25173154:_____/15:#0000427 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Indirect and direct effects of wetlands on climate in terms of thermodynamics of life

Popis výsledku v původním jazyce

This presentation deals with a largely unrecognised service of wetlands – their role in regulating air temperature through evapotranspiration. We explain quantitatively how solar energy striking the earth´s surface is dissipated by water (expressed in energy units (W m-2)) in three processes: dissolution-precipitation of salts, disintegration-recombination of the water molecule in biological processes and evapotranspiration-condensation. The direct effect of wetlands on regional climate, through reduction of temperature gradients and the role of water vapour and clouds in lowering the passage of solar radiation are then described. We quantify the huge upsurge of sensible heat (warm air) that must have occurred after the drainage of wetlands in the northern hemisphere over the past 250 years. The radiative forcing that is caused by the increase in greenhouse gases in the atmosphere over the same period (from 1 to 3 W m-2 from 1750 to the present day) is markedly lower than radiative forcing caused by wetland drainage and indeed, is too small to measure. The amounts of carbon dioxide, methane and water vapour in atmosphere and their dynamics are compared. We question the meaning of ‘average temperature’ as the criterion of climate change in terms of thermodynamics. We show temperature differences in the present-day cultural landscape, on a clear sunny day, in thermovision pictures: wetlands and forests are of 20 oC cooler than drained surfaces.

Název v anglickém jazyce

Indirect and direct effects of wetlands on climate in terms of thermodynamics of life

Popis výsledku anglicky

This presentation deals with a largely unrecognised service of wetlands – their role in regulating air temperature through evapotranspiration. We explain quantitatively how solar energy striking the earth´s surface is dissipated by water (expressed in energy units (W m-2)) in three processes: dissolution-precipitation of salts, disintegration-recombination of the water molecule in biological processes and evapotranspiration-condensation. The direct effect of wetlands on regional climate, through reduction of temperature gradients and the role of water vapour and clouds in lowering the passage of solar radiation are then described. We quantify the huge upsurge of sensible heat (warm air) that must have occurred after the drainage of wetlands in the northern hemisphere over the past 250 years. The radiative forcing that is caused by the increase in greenhouse gases in the atmosphere over the same period (from 1 to 3 W m-2 from 1750 to the present day) is markedly lower than radiative forcing caused by wetland drainage and indeed, is too small to measure. The amounts of carbon dioxide, methane and water vapour in atmosphere and their dynamics are compared. We question the meaning of ‘average temperature’ as the criterion of climate change in terms of thermodynamics. We show temperature differences in the present-day cultural landscape, on a clear sunny day, in thermovision pictures: wetlands and forests are of 20 oC cooler than drained surfaces.

Druh

D - Stať ve sborníku

CEP obor

EH - Ekologie – společenstva

OECD FORD obor

—

Projekt

<a href="/cs/project/TE02000077" target="_blank" >TE02000077: Inteligentní Regiony - Informační modelování budov a sídel, technologie a infrastruktura pro udržitelný rozvoj</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

9th International Workshop on Nutrient Cycling and Retention in Natural and Constructed Wetlands

ISBN

978-80-905483-2-9

ISSN

—

e-ISSN

—

Počet stran výsledku

4

Strana od-do

60-63

Název nakladatele

ENKI, o.p.s.

Místo vydání

Třeboň

Místo konání akce

Třeboň

Datum konání akce

—

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—