Akademik Veri Yönetim Sistemi
27th International Union of Geodesy and Geophysics (IUGG) General Assembly, Montreal, Kanada, 8 - 18 Temmuz 2019, ss.1-2
One of the mostly investigated application areas in gravimetry missions e.g. GRACE (Gravity
Recovery and Climate Experiment) is drought monitoring from the hydrological perspective.
When studying drought monitoring, scientific questions concerns primarily observed drought
periods, spatial distribution of the drought, long-term mass change, impact on terrestrial water
storage (TWS) variations and possible causes of the drought. Recently, NASA finds drought in
the Eastern Mediterranean worst of past 900 years. Thus, it has been critical to study an eventual
drought events in a Mediterranean climate region which has not been much investigated with
satellite technics. GRACE Level 3 (Release05-RL05) monthly land mass data of the Centre for
Space Research (CSR) processing center covering the period from April 2002 to January 2016,
Global Land Data Assimilation System (GLDAS: MOS, NOAH, VIC), and Tropical Rainfall
Measuring Mission (TRMM-3B43) models and drought indices such as self-calibrating Palmer
Drought Severity (SCPDSI), El Niño–Southern Oscillation (ENSO), and North Atlantic
Oscillation (NAO) are used to reply above-mentioned scientific questions in Turkey as study
area. We found that GRACE results reveal drought periods by a significant decrease in the TWS
signal. The spatial distribution of the drought is primarily conducted by the precipitation
patterns. Turkey observe a decreasing annual trend of TWS with 1 cm/yr. GRACE is more
sensitive to meteorological drought and can predict a possible drought event 9 months before
compared to traditional studies. One possible reason of the drought in Turkey seems to be
related with the La Nina effect from the climatic perspective.