TY  - THES
A1  - Hoff, Holger
T1  - Teleconnections in the global water system, their impacts on local water resources, and opportunities for addressing them in IWRM
Y1  - 2013
CY  - Potsdam
ER  - 
TY  - JOUR
A1  - Kundzewicz, Zbigniew W.
A1  - Budhakooncharoen, Saisunee
A1  - Bronstert, Axel
A1  - Hoff, Holger
A1  - Lettenmaier, Dennis P.
A1  - Menzel, Lucas
A1  - Schulze, Roland
T1  - Coping with variability and climate change : floods and droughts
Y1  - 2001
ER  - 
TY  - BOOK
A1  - Kundzewicz, Zbigniew W.
A1  - Budhakooncharoen, Saisunee
A1  - Bronstert, Axel
A1  - Hoff, Holger
A1  - Lettenmaier, Dennis P.
A1  - Menzel, Lucas
A1  - Schulze, Roland
T1  - Floods and droughts : coping with variability and climate change ; thematic backround paper [for the International Conference on Freshwater 2001, Bonn, 3-7 December 2001]
Y1  - 2001
UR  - http://www.water-2001.de/co_doc/Floods.pdf
PB  - Secretariat of the International Conference on Freshwater
CY  - Bonn
ER  - 
TY  - JOUR
A1  - Gerten, Dieter
A1  - Hoff, Holger
A1  - Bondeau, Alberte
A1  - Lucht, Wolfgang
A1  - Smith, Pascalle
A1  - Zaehle, Sönke
T1  - Contemporary "green" water flows : simulations with a dynamic global vegetation and water balance model
N2  - "Green water"-the water stored in the soil and productively used for plant transpiration-is an important quantity particularly in rainfed agriculture (in contrast to "blue water" available in streams and lakes, on which irrigation relies). This study provides preliminary estimates of contemporary (1961-1990) global green water flows (i.e. plant transpiration), using a well-established, process-based dynamic global vegetation and water balance model, LPJ. Transpiration is analysed with respect to differences between a simulation that accounts for human land cover changes and a simulation under conditions of potential natural vegetation. We found that historic land cover change usually reduced the green water flow to the atmosphere, resulting in a global decrease of similar to 7% in total. To further explore how the biophysical setting influences the green water flow, we analyse the ratio between soil moisture-limited canopy conductance of carbon and water and energy-controlled potential conductance. This plant physiology-based ratio measures the degree to which actual green water flow falls below the potential flow that would occur when the soil is saturated, thus it represents a measure of the water limitation of terrestrial vegetation. We found that plant water limitation is lowest in the wet tropics and at high latitudes, where soil moisture is high enough to meet the atmospheric demand for transpiration. The present results are preliminary, since irrigation is not yet accounted for, and because the model simulations are compromised primarily by the quality of the input data. A more comprehensive and consistent assessment of global green and blue water flows and limitations using an enhanced LPJ model is identified as a prime task for future studies. (c) 2005 Elsevier Ltd. All rights reserved
Y1  - 2005
SN  - 1474-7065
ER  -