Description: Das Projekt "Monitoring changes in biodiversity at regional and continental scales over the past three decades using a dynamic habitat index derived from historical satellite data" wird vom Umweltbundesamt gefördert und von Universität Bern, Geographisches Institut, Gruppe für Klimatologie,Meteorologie durchgeführt. Understanding the drivers behind the loss of biodiversity currently observed is of major importance in the context of the global change discussion. For studies of biodiversity at broad spatial scales, satellite remote sensing is the premier source of information, as it is uniquely capable of covering large areas of the Earth at high temporal resolution. The underlying assumption is that satellite-derived geophysical surface parameters, such as vegetation greenness, are related to biodiversity. For that purpose, concepts such as the Dynamic Habitat Index (DHI) were recently developed. The DHI combines information on the overall greenness, the base level of vegetation cover, and vegetation seasonality at a certain location. By comparing the annual DHI with a long term mean, areas undergoing disturbances or recovery events can be delineated, which are indicative of changes in species composition and diversity. The concept of the DHI was developed for data obtained from the Moderate Resolution Imaging Spectroradiometer (MODIS) post-2000. However, for climate change impact studies a longer time series is desirable. The only sensor system suitable for such applications is the Advanced Very High Resolution Radiometer (AVHRR), which has been in orbit on various platforms since the early 1980ies. The purpose of this project was to develop a methodology to derive long term information on habitat conditions at continental scales based on historical satellite data. In particular, the goal was to adopt the principle of the DHI as developed for the MODIS sensor to an AVHRR archive at 1 km spatial resolution over Canada and to analyze long term variations in the DHI. In a first project phase, an AVHRR data set of vegetation greenness, generated in the framework of the project, was validated against the reference MODIS product. The results demonstrated a very good agreement between both data sets for a wide range of vegetation types and on various spatial and temporal scales. A historical baseline of habitat conditions post-1987 based on the DHI was subsequently generated based on the long term AVHRR data. The analysis of the DHI showed that certain areas, particularly northern parts of the Province of Quebec as well as southwestern Canada, experienced significant changes over the past two decades, which may have had significant impacts on species diversity and abundance in these areas. In the future, the methods developed in the framework of this project may be used to obtain information on long term variations in habitat conditions in areas covered by other historical satellite archives, e.g., for Europe based on an AVHRR archive hosted at the University of Bern.
Types:
SupportProgram
Origin: /Bund/UBA/UFORDAT
Tags: Messgerät ? Vegetation ? Klimatologie ? Meteorologie ? Satellitendaten ? Sensor ? Skigebiet ? Brunnen ? Kanada ? Biodiversitätsverlust ? Habitat ? Radiometrie ? Register ? Satellit ? Europa ? Warenangebot ? Artenvielfalt ? Artenzusammensetzung ? Daten ? Monitoring ? Störfall ? Studie ? Vertrag ? Zeitreihe ? Boden ? Schaden ? Wirkung ? Globale Veränderung ? Satellitenfernerkundung ? Klimafolgen ? Abdeckung ? Erholung ? Kenngröße ? Klassifikation ? Ökosystem ? Produkt ? Änderung ? Biodiversität ? DATENSATZ ? NEU ? DAUER ? Diversität ? TEIL ? VERGLEICHEN ? VERHAELTNIS ? ERGEBNIS ? FAEHIG ? FORTSCHRITTLICH ? GESCHICHTLICH ? GRUNDSAETZE ? GRUNDSATZ ? VERWANDT ? Verwertung ? GUETER ? Vorgang ? ZWECKBESTIMMUNG ? INFORMATIONSQUELLE ? NOERDLICH ? OBERFLAECHE ? PROJEKT ? REFERENZ ? REGIONAL ? Basen [chemisch] ? BEWERTEN ? METHODE ? SONSTIG ? STANDORT ? METHODIK ? Bahnsteig ?
License: cc-by-nc-nd/4.0
Language: Deutsch
Time ranges: 2010-07-01 - 2011-06-30
Accessed 1 times.