Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data

Linghui Sun, Jessica Baker, Emanuel Gloor, Dominick Spracklen, Hartmut Boesch, Peter Somkuti, Eduardo Eiji Maeda, Wolfgang Buermann

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

Kuvaus

We analyzed seasonal and spatial variations of evapotranspiration (ET) for five Amazon sub-basins and their response to the 2015/16 El Nino episode using a recently developed water-budget approach. ET varied typically between similar to 7 and 10 cm/month with exception of the Xingu basin for which it varied between 10 and 15 cm/month. Outstanding features of ET seasonality are (i) generally weak seasonality, (ii) two ET peaks for the two very wet catchments Solimoes and Negro, with one occurring during the wet season and one during the drier season, and (iii) a steady increase of ET during the second half of the dry season for the three drier catchments (Madeira, Tapajos, Xingu). Peak ET occurs during the first half of the wet season consistent with leaf flush occurring before the onset of the wet season. With regards to inter-annual variation, we found firstly that for the Solimoes and Madeira catchments the period with large positive wet season anomalies (2012-2015) is associated with negative ET anomalies, and negative SIF (solar induced fluorescence) anomalies. Furthermore, we found negative ET of several cm/months and SIF (up to 50%) anomalies for most of the Amazon basin during the 2015/16 El Nino event suggesting down-regulation of productivity as a main factor of positive carbon flux anomalies during anomalously hot and dry conditions. These results are of interest in view of predicted warmer and more erratic future climate conditions.

Alkuperäiskielienglanti
Artikkeli32
LehtiFrontiers in Earth Science
Vuosikerta7
Sivut1-9
Sivumäärä9
ISSN2296-6463
DOI - pysyväislinkit
TilaJulkaistu - 19 maaliskuuta 2019
OKM-julkaisutyyppiA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä, vertaisarvioitu

Tieteenalat

  • 1171 Geotieteet

Lainaa tätä

Sun, Linghui ; Baker, Jessica ; Gloor, Emanuel ; Spracklen, Dominick ; Boesch, Hartmut ; Somkuti, Peter ; Maeda, Eduardo Eiji ; Buermann, Wolfgang . / Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data. Julkaisussa: Frontiers in Earth Science. 2019 ; Vuosikerta 7. Sivut 1-9.
@article{1b3ca6a8465341f98b8bda7e1d31a5da,
title = "Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data",
abstract = "We analyzed seasonal and spatial variations of evapotranspiration (ET) for five Amazon sub-basins and their response to the 2015/16 El Nino episode using a recently developed water-budget approach. ET varied typically between similar to 7 and 10 cm/month with exception of the Xingu basin for which it varied between 10 and 15 cm/month. Outstanding features of ET seasonality are (i) generally weak seasonality, (ii) two ET peaks for the two very wet catchments Solimoes and Negro, with one occurring during the wet season and one during the drier season, and (iii) a steady increase of ET during the second half of the dry season for the three drier catchments (Madeira, Tapajos, Xingu). Peak ET occurs during the first half of the wet season consistent with leaf flush occurring before the onset of the wet season. With regards to inter-annual variation, we found firstly that for the Solimoes and Madeira catchments the period with large positive wet season anomalies (2012-2015) is associated with negative ET anomalies, and negative SIF (solar induced fluorescence) anomalies. Furthermore, we found negative ET of several cm/months and SIF (up to 50{\%}) anomalies for most of the Amazon basin during the 2015/16 El Nino event suggesting down-regulation of productivity as a main factor of positive carbon flux anomalies during anomalously hot and dry conditions. These results are of interest in view of predicted warmer and more erratic future climate conditions.",
keywords = "1171 Geosciences, Amazonia, El Nino, Evapotranspiration, Forest Productivity, Solar induced fluorescence, RAIN-FOREST, CARBON, SATELLITE, BASIN, PHOTOSYNTHESIS, FLUORESCENCE, VARIABILITY, SENSOR, BRAZIL, GRACE",
author = "Linghui Sun and Jessica Baker and Emanuel Gloor and Dominick Spracklen and Hartmut Boesch and Peter Somkuti and Maeda, {Eduardo Eiji} and Wolfgang Buermann",
year = "2019",
month = "3",
day = "19",
doi = "10.3389/feart.2019.00032",
language = "English",
volume = "7",
pages = "1--9",
journal = "Frontiers in Earth Science",
issn = "2296-6463",
publisher = "Frontiers Media",

}

Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data. / Sun, Linghui ; Baker, Jessica; Gloor, Emanuel ; Spracklen, Dominick ; Boesch, Hartmut ; Somkuti, Peter ; Maeda, Eduardo Eiji; Buermann, Wolfgang .

julkaisussa: Frontiers in Earth Science, Vuosikerta 7, 32, 19.03.2019, s. 1-9.

Tutkimustuotos: ArtikkelijulkaisuArtikkeliTieteellinenvertaisarvioitu

TY - JOUR

T1 - Seasonal and Inter-annual Variation of Evapotranspiration in Amazonia Based on Precipitation, River Discharge and Gravity Anomaly Data

AU - Sun, Linghui

AU - Baker, Jessica

AU - Gloor, Emanuel

AU - Spracklen, Dominick

AU - Boesch, Hartmut

AU - Somkuti, Peter

AU - Maeda, Eduardo Eiji

AU - Buermann, Wolfgang

PY - 2019/3/19

Y1 - 2019/3/19

N2 - We analyzed seasonal and spatial variations of evapotranspiration (ET) for five Amazon sub-basins and their response to the 2015/16 El Nino episode using a recently developed water-budget approach. ET varied typically between similar to 7 and 10 cm/month with exception of the Xingu basin for which it varied between 10 and 15 cm/month. Outstanding features of ET seasonality are (i) generally weak seasonality, (ii) two ET peaks for the two very wet catchments Solimoes and Negro, with one occurring during the wet season and one during the drier season, and (iii) a steady increase of ET during the second half of the dry season for the three drier catchments (Madeira, Tapajos, Xingu). Peak ET occurs during the first half of the wet season consistent with leaf flush occurring before the onset of the wet season. With regards to inter-annual variation, we found firstly that for the Solimoes and Madeira catchments the period with large positive wet season anomalies (2012-2015) is associated with negative ET anomalies, and negative SIF (solar induced fluorescence) anomalies. Furthermore, we found negative ET of several cm/months and SIF (up to 50%) anomalies for most of the Amazon basin during the 2015/16 El Nino event suggesting down-regulation of productivity as a main factor of positive carbon flux anomalies during anomalously hot and dry conditions. These results are of interest in view of predicted warmer and more erratic future climate conditions.

AB - We analyzed seasonal and spatial variations of evapotranspiration (ET) for five Amazon sub-basins and their response to the 2015/16 El Nino episode using a recently developed water-budget approach. ET varied typically between similar to 7 and 10 cm/month with exception of the Xingu basin for which it varied between 10 and 15 cm/month. Outstanding features of ET seasonality are (i) generally weak seasonality, (ii) two ET peaks for the two very wet catchments Solimoes and Negro, with one occurring during the wet season and one during the drier season, and (iii) a steady increase of ET during the second half of the dry season for the three drier catchments (Madeira, Tapajos, Xingu). Peak ET occurs during the first half of the wet season consistent with leaf flush occurring before the onset of the wet season. With regards to inter-annual variation, we found firstly that for the Solimoes and Madeira catchments the period with large positive wet season anomalies (2012-2015) is associated with negative ET anomalies, and negative SIF (solar induced fluorescence) anomalies. Furthermore, we found negative ET of several cm/months and SIF (up to 50%) anomalies for most of the Amazon basin during the 2015/16 El Nino event suggesting down-regulation of productivity as a main factor of positive carbon flux anomalies during anomalously hot and dry conditions. These results are of interest in view of predicted warmer and more erratic future climate conditions.

KW - 1171 Geosciences

KW - Amazonia

KW - El Nino

KW - Evapotranspiration

KW - Forest Productivity

KW - Solar induced fluorescence

KW - RAIN-FOREST

KW - CARBON

KW - SATELLITE

KW - BASIN

KW - PHOTOSYNTHESIS

KW - FLUORESCENCE

KW - VARIABILITY

KW - SENSOR

KW - BRAZIL

KW - GRACE

U2 - 10.3389/feart.2019.00032

DO - 10.3389/feart.2019.00032

M3 - Article

VL - 7

SP - 1

EP - 9

JO - Frontiers in Earth Science

JF - Frontiers in Earth Science

SN - 2296-6463

M1 - 32

ER -