Terrestrial water fluxes dominated by transpiration

  title={Terrestrial water fluxes dominated by transpiration},
  author={Scott Jasechko and Zachary Sharp and John J. Gibson and S.J. Birks and Yi Yi and Peter J. Fawcett},
Renewable fresh water over continents has input from precipitation and losses to the atmosphere through evaporation and transpiration. Global-scale estimates of transpiration from climate models are poorly constrained owing to large uncertainties in stomatal conductance and the lack of catchment-scale measurements required for model calibration, resulting in a range of predictions spanning 20 to 65 per cent of total terrestrial evapotranspiration (14,000 to 41,000 km3 per year) (refs 1, 2, 3, 4… 
An isotopic approach to partition evapotranspiration in a mixed deciduous forest
Transpiration (T) is perhaps the largest fluxes of water from the land surface to the atmosphere and is susceptible to changes in climate, land use and vegetation structure. However, predictions of
Revisiting the contribution of transpiration to global terrestrial evapotranspiration
Even though knowing the contributions of transpiration (T), soil and open water evaporation (E), and interception (I) to terrestrial evapotranspiration (ET = T + E + I) is crucial for understanding
Hydrologic connectivity constrains partitioning of global terrestrial water fluxes
Two large-scale flux-partitioning approaches were combined to quantify evapotranspiration subcomponents and the hydrologic connectivity of bound, plant-available soil waters with more mobile surface waters.
Terrestrial water fluxes dominated by transpiration: Comment
The fraction of evapotranspiration (ET) attributed to plant transpiration (T) is an important source of uncertainty in terrestrial water fluxes and land surface modeling (Lawrence et al. 2007,
Stomatal response to humidity and CO2 implicated in recent decline in US evaporation
This study utilizes an emergent relation between the land surface and atmospheric boundary layer to infer daily evapotranspiration from historical meteorological data collected at 236 weather stations across the United States, and explains changes in inferred surface conductance as a response to increases in carbon dioxide and, more recently, to an abrupt decrease in atmospheric humidity.
A Reconnaissance Study of Water and Carbon Fluxes in Tropical Watersheds of Peninsular Malaysia: Stable Isotope Constraints
Evapotranspiration is a nexus for planetary energy and carbon cycles, as yet poorly constrained. Here I use stable isotopes of oxygen and hydrogen to partition flux of water due to plant
Connections between groundwater flow and transpiration partitioning
Groundwater flow drives partitioning Soil evaporation and plant transpiration together contribute a substantial proportion of terrestrial freshwater fluxes. Land surface models are used to understand
A preliminary isotope‐based evapotranspiration partitioning approach for tropical Costa Rica
Spatially and seasonally distributed information on transpiration (T) fluxes is limited in the tropics. Here, we applied a coupled isotope mass balance model to separate water fluxes of T and
Partitioning of evapotranspiration in remote sensing-based models
Dominant controls of transpiration along a hillslope transect inferred from ecohydrological measurements and thermodynamic limits
Abstract. We combine ecohydrological observations of sap flow and soil moisture with thermodynamically constrained estimates of atmospheric evaporative demand to infer the dominant controls of forest


Recent decline in the global land evapotranspiration trend due to limited moisture supply
An estimate of global land evapotranspiration from 1982 to 2008 is provided using a global monitoring network, meteorological and remote-sensing observations, and a machine-learning algorithm, which suggests that increasing soil-moisture limitations on evapOTranspiration largely explain the recent decline of the global land-evapotranpiration trend.
Mean annual GPP of Europe derived from its water balance
On local scale, the eddy covariance technique is suited to estimate gross primary production (GPP). Scaling up such observations to the regional and continental level, however, remains a challenge.
Estimates of Freshwater Discharge from Continents: Latitudinal and Seasonal Variations
Annual and monthly mean values of continental freshwater discharge into the oceans are estimated at 18 resolution using several methods. The most accurate estimate is based on streamflow data from
deltaO of water vapour, evapotranspiration and the sites of leaf water evaporation in a soybean canopy.
High-frequency measurements of oxygen isotopic compositions of water vapour and evapotranspiration above a soybean canopy using the tunable diode laser (TDL) technique for the entire 2006 growing season in Minnesota, USA find that vertical variability in relative humidity and temperature associated with canopy structure must be addressed in canopy-scale leaf water models.
Terrestrial Gross Carbon Dioxide Uptake: Global Distribution and Covariation with Climate
Estimates of spatially distributed GPP and its covariation with climate can help improve coupled climate–carbon cycle process models.
Determining water use by trees and forests from isotopic, energy balance and transpiration analyses: the roles of tree size and hydraulic lift.
  • T. Dawson
  • Environmental Science
    Tree physiology
  • 1996
Groundwater discharge from sugar maple trees and forest stands of different sizes (ages) differs significantly, and large trees and older forest stands have a greater impact on the hydrologic balance of groundwater than small trees and younger forest stands.
Fluxes of CO2 and water between terrestrial vegetation and the atmosphere estimated from isotope measurements
THE atmospheric budget of carbon compounds can be balanced only by invoking a significant 'missing sink' for carbon dioxide1–3. Identifying this sink requires a knowledge of CO2 fluxes at global and
The Partitioning of Evapotranspiration into Transpiration, Soil Evaporation, and Canopy Evaporation in a GCM: Impacts on Land–Atmosphere Interaction
Abstract Although the global partitioning of evapotranspiration (ET) into transpiration, soil evaporation, and canopy evaporation is not well known, most current land surface schemes and the few
Ocean Salinities Reveal Strong Global Water Cycle Intensification During 1950 to 2000
50 years of observations of sea surface salinity data are examined and show that ocean salinity patterns express an identifiable fingerprint of an intensifying water cycle, suggesting that a substantial intensification of the global water cycle will occur in a future 2° to 3° warmer world.