Influence of atmospheric internal variability on the long-term Siberian water cycle during the past 2 centuries

Oshima, Kazuhiro; Ogata, Koto; Park, Hotaek; Tachibana, Yoshihiro

doi:https://doi.org/10.5194/esd-9-497-2018

Articles | Volume 9, issue 2

https://doi.org/10.5194/esd-9-497-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/esd-9-497-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 9, issue 2

Research article

|

16 May 2018

Research article |

| 16 May 2018

Influence of atmospheric internal variability on the long-term Siberian water cycle during the past 2 centuries

Kazuhiro Oshima, Koto Ogata, Hotaek Park, and Yoshihiro Tachibana

Data sets

JRA-55 JRA http://jra.kishou.go.jp/JRA-55/index_en.html

GPCC precipitation NOAA ESRL https://www.esrl.noaa.gov/psd/data/gridded/data.gpcc.html

20CR reanalysis NOAA ESRL https://www.esrl.noaa.gov/psd/data/20thC_Rean/

CMIP3 simulations PCMDI https://pcmdi.llnl.gov/mips/cmip3/

Short summary

Long-term variations in the Siberian river discharges of the Lena in the east and the Ob in the west were examined based on the observations, tree-ring reconstructions, and simulations with atmospheric and climate models. The discharges of the two rivers tended to be negatively correlated during the past 2 centuries. An east–west seesaw pattern of summertime large-scale atmospheric circulation frequently emerges over Siberia as an internal variability. This results in the negative correlations.