Quantifying the mitigation of temperature extremes by forests and wetlands in a temperate landscape

  • As a result of ongoing climate change and more frequent heat events, the regulating services of land cover in terms of moderating and mitigating local temperatures are increasingly important. While the reduced temperatures found in forests and wetlands are recognized, their wider contribution to regional landscape cooling remains largely uncharacterized and unquantified. Herein, we propose and test a new method that estimates the temperature response and inertia of landscapes in high temperatures, based on land cover share. In order to achieve this goal, we combined the MODIS daytime land surface temperature (henceforth LST) time series and CORINE land cover data. We classified the time series in two ways, i.e. by stepwise temperature range (−10/−5 °C to +35/+40 °C) and by the occurrence of hot days (days with a mean LST ≥ 30 °C). As an explanatory variable, we developed and used a greenest pixel composite of the MODIS normalized difference vegetation index (NDVI) time series. In our study area, covering parts of northeastern GermanyAs a result of ongoing climate change and more frequent heat events, the regulating services of land cover in terms of moderating and mitigating local temperatures are increasingly important. While the reduced temperatures found in forests and wetlands are recognized, their wider contribution to regional landscape cooling remains largely uncharacterized and unquantified. Herein, we propose and test a new method that estimates the temperature response and inertia of landscapes in high temperatures, based on land cover share. In order to achieve this goal, we combined the MODIS daytime land surface temperature (henceforth LST) time series and CORINE land cover data. We classified the time series in two ways, i.e. by stepwise temperature range (−10/−5 °C to +35/+40 °C) and by the occurrence of hot days (days with a mean LST ≥ 30 °C). As an explanatory variable, we developed and used a greenest pixel composite of the MODIS normalized difference vegetation index (NDVI) time series. In our study area, covering parts of northeastern Germany and western Poland, the fragmented landscape has heterogeneous temperature patterns, including urban heat islands, warm agricultural areas, cool forests and cold wetlands. We found that at high temperature ranges only forests and wetlands remained comparably cool, with LSTs up to 20.8 °C lower than the maximum LST in the study area. The analysis of land cover shares and LSTs revealed the substantial cooling effect of forests and wetlands in line with increasing land cover share in higher temperature ranges, as well as on hot days. The relation between LST and the NDVI indicated vegetation cover as the cause. We propose the corresponding metrics to quantify landscape-level temperature regulation. Equally, we advocate for management to identify these ecosystem services and their current and potential contributions, along with implications for sustaining and increasing, both tree cover and wetlands and thereby adapting landscapes to climate change.show moreshow less

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Metadaten
Author:Charlotte GohrORCiD, Jeanette Silvin BlumröderORCiDGND, Douglas Sheil, Pierre L. IbischORCiDGND
URN:urn:nbn:de:kobv:eb1-opus-4376
DOI:https://doi.org/10.1016/j.ecoinf.2021.101442
ISSN:1574-9541
Parent Title (English):Ecological Informatics
Publisher:Elsevier
Document Type:Article
Language:English
Year of Completion:2021
Date of first Publication:2021/10/07
Publishing Institution:Hochschule für nachhaltige Entwicklung Eberswalde
Release Date:2023/04/18
Issue:66
Article Number:101442
Institutions / Departments:Fachbereich Wald und Umwelt
Wissenschaftliche Einrichtungen HNEE / Biosphere Reserves Institute
University Bibliography:University Bibliography
Peer-Review / Referiert
Licence (German):License LogoUrheberrechtsschutz
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