Extreme drought conditions in Turkey observed by satellite gravity measurements


OKAY AHİ G.

Gravity, Geoid and Height Systems 2nd Joint Commission 2 and IGFS Meeting, 2018, Kopenhag, Denmark, 17 September 2018, pp.1

  • Publication Type: Conference Paper / Summary Text
  • City: Kopenhag
  • Country: Denmark
  • Page Numbers: pp.1
  • Hacettepe University Affiliated: Yes

Abstract

Hydrological mass transport processes are important for the climate change, disaster assessments, the drought and flood analysis, monitoring either in continental scale or in global scale, while it is complex because of the diversity of the various parameters with limited in-situ measurements, particularly extreme droughts. Recently, satellite gravimetric missions especially GRACE (Gravity Recovery and Climate Experiment) contributed in a significant way for the study and the monitoring of hydrologic mass changes. In this study, hydrological mass variations and extreme drought monitoring are investigated and evaluated from GRACE and models data in Turkey, including GRACE data in form of monthly land mass grids (1°x1°) obtained from CSR (Centre for Space Research) covering the period from April 2002 to January 2016, Global Land Data Assimilation System (GLDAS: MOS, Noah, VIC) with 1°x 1° spatial resolution and Tropical Rainfall Measuring Mission (TRMM-3B43) models with 0.25°x0.25° spatial resolution, Self-calibrating Palmer Drought Severity (SCPDSI) considered as a meteorological drought indicator and sometimes an agricultural drought indicator, and ENSO (El Niño–Southern Oscillation) indexes. Results show significant droughts in 2008 and 2013-2014, which are confirmed by the SCPDSI index and precipitation level. Drought in Turkey seems to be primarily related with the meteorology.