 |
| Titel |
Benchmark products for land evapotranspiration: LandFlux-EVAL multi-dataset synthesis |
| VerfasserIn |
Brigitte Mueller, Martin Hirschi, Sonia Seneviratne |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250084278
|
|
|
|
|
|
| Zusammenfassung |
| Land evapotranspiration (ET) estimates are available from several global datasets. We have
merged a total of 40 individual datasets over the time periods 1989-1995 and 14
datasets over 1989-2005 and present here the resulting monthly global land ET
synthesis products. In the individual datasets, ET is derived from satellite and/or in-situ
observations (diagnostic datasets) or calculated via land-surface models (LSMs) driven
with observations-based forcing and atmospheric reanalyses. Statistics (such as
median, mean, interquartile ranges etc.) for four merged synthesis products are
provided, one including all datasets and three including only datasets from one
category each (diagnostic, LSMs, and reanalyses). The multi-annual variations
of ET in the merged synthesis products display realistic responses. They are also
consistent with previous findings of a global increase in ET between 1989 and
1997 (1.15 mm/yr2 in our merged product based on all 14 estimates) followed by a
decrease in this trend (-1.40 mm/yr2), although these trends are small compared to the
uncertainty of absolute ET values. The global mean ET from the merged synthesis
products (based on all datasets) is 1.35 mm per day for both the 1989-1995 and
1989-2005 products, which is relatively low compared to previously published estimates.
We estimate global runoff (precipitation minus ET) to 34’406 km3 per year for
a total land area of 130’922 km2. The here presented monthly ET data (merged
synthesis products) are useful for model validation and climate research in general. |
|
|
|
|
|
|