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Found 773 results.

CDC (Climate Data Center)

Free access and download to of a growing selection of DWD’s climate data. Via CDC Search you will find data for direct download and interactive access to station data. The interactive mode gives graphical and tabular previews of the German station data. In addition, all data sets remain accessible from our ftp server for direct download

High Elevation Treeline Research

If one considers the high elevation treeline as a global phenomenon, many local drivers, which dominated the debate in the past, become less significant, they become modulators of a more fundamental, common cause. Our working hypothesis is that the major driver of treeline formation is the ability to form new structures, rather than the provision of raw materials for these structures. In other words, we suggest that the treeline is a sink (growth) rather then a source (photosynthesis) driven phenomenon, with temperature representing the single most important determinant. We do not question the influence of other factors, but we consider them to represent a suite of regional peculiarities, which may affect the actual position by not more then 100 m in elevation. A detailed discussion of the treeline issue can be found in: Our activities go in several directions. They include treering studies across the treeline ecotone (see ref. below), microclimate measurements at various latitudes and an assessment of the carbohydrate supply status at the tree limit. The worldwide treeline temperature assessment nears its end by 2001, when year-round data from ca. 30 different treeline sites around the globe will be available. As a standard procedure we measure root-zone temperature at 10 cm depth in the shade of tree crowns at the treeline using Tidbit (Onset Corp.) data loggers. Currently available data from 90 % of the stations average at seasonal mean ground temperatures of ca 6.5 C, with very little site to site variation, irrespective of latitude (minimum of 5.5 C on Mexican volcanos at 4000 m and maximum at some maritime temperate zone treelines of ca 7.5 C). The seasonal mean proved to be a better predictor of treeline position than warmest month temperatures or a suite of thermal sums tested. There are regions with no suitable treeline taxa where natural treelines occure at lower elevations (higher temperatures; e.g. Hawaii). In a work on carbohydrate pools we compare treelines in Mexico, the central Alps and in N-Sweden (Abisko). We see no decline of reserves as one approaches the existential limit of trees, in fact, carbohydrate and lipid stores reach a maximum at tree limit. Thus, it seems unlikely that carbon limitation is a cause of treeline formation.

openSenseMap: Sensor Box MK Bodenfeuchte 14

Projekt Mikroklima Technische Datenerfassung, Auswertung u. Visualisierung Ansprechpartner: E. Schulz (schulz.bk@gmail.com)

openSenseMap: Sensor Box HE Grundschule am Tegelschen Ort senseBox2

Das ist eine senseBox der Humboldt Explorers. Weitere Informationen unter www.humboldt-explorers.de

openSenseMap: Sensor Box HE Sachsenwald-Grundschule senseBox7

Das ist eine senseBox der Humboldt Explorers. Weitere Informationen unter www.humboldt-explorers.de

openSenseMap: Sensor Box HE Grundschule am Tegelschen Ort senseBox8

Das ist eine senseBox der Humboldt Explorers. Weitere Informationen unter www.humboldt-explorers.de

openSenseMap: Sensor Box HE Freie Georgschule senseBox8

Das ist eine senseBox der Humboldt Explorers. Besuchen Sie uns unter: https://www.humboldt-explorers.de/

openSenseMap: Sensor Box HE Freie Georgschule senseBox2

Das ist eine senseBox der Humboldt Explorers. Besuchen Sie uns unter: https://www.humboldt-explorers.de/

Estimates of land surface air temperature changes homogenised using sparse input 20th Century reanalysis product 20CRv3

The data consist of 4 frozen gridded estimates as described in Gillespie et al, 2022. The data are presented as 5 degree resolution global fields over 1850-2014. Station data arising from the International Surface Temperature Initiative (ISTI) global databank of monthly holdings have been homogenised using 20CRv3 to identify breakpoints. Four distinct approaches to adjustment have been undertaken resulting in 4 separate estimates of the resulting series. The gridding is a simple gridbox average of any observations available within each 5 degree gridbox. Data is available for those global land areas for which underlying station data are available in teh ISTI holdings.

Beobachtungen an Straßenwetterstationen (Glättemeldeanlagen)

Beobachtungen an deutschlandweit verteilten Straßenwetterstationen. Meteorologische Parameter wie Temperatur, Niederschlag usw. werden alle 15 Minuten gemessen.

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