Performance evaluation of satellite- and model-based precipitation products over varying climate and complex topography

Date

2020-05-01

Author

Amjad, Muhammad
Yılmaz, Mustafa Tuğrul
Yücel, İsmail
Yılmaz, Koray Kamil

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

124
views

0
downloads

Accuracy assessment of precipitation retrievals is a pre-requisite for many hydrological studies as it helps to understand the source and the magnitude of the uncertainty in hydrological response variables, particularly over regions with complex topography. This study evaluates GPM IMERGv05, TMPA 3B42V7, ERA-Interim, and ERA5 precipitation products using 256 ground-based gauge stations between 2014 and 2018 over Turkey known to have complex topography and varying climate. Error statistics, categorical performance indices, and intensity-frequency distribution of the precipitation products are investigated over varying wetness and terrain slope classes. Results show that while the monthly correlation coefficient averaged over all the products is 0.79 for regions having slopes between 5 and 10%, this value drops to 0.74 when the slope is above 15%. IMERG, TMPA and ERA-Interim products underestimate the observed precipitation over relatively wetter regions, while they overestimate over relatively drier regions and relatively higher slopes. ERA5 consistently overestimates the observed precipitation over all the wetness and slope classes. Overall, TMPA shows the smallest wet bias (0.1 mm/day), while ERA5 has the largest wet bias (0.5 mm/day). IMERG has the highest monthly correlation (i.e., 0.82 when averaged for all 256 stations) and ERA-Interim has the lowest correlation (0.77) against the ground-based observations. The successors (IMERG and ERA5) show smaller ErrSD and higher CC compared to their predecessors (TMPA and ERA-Interim) at both daily and monthly time scales. The results also show that the studied satellite-based products perform better in matching the frequency of daily precipitation intensities, whereas the studied model-based products perform better in terms of categorical performance indices for lighter precipitation events.

Subject Keywords

Water Science and Technology

URI

https://hdl.handle.net/11511/34734

Journal

JOURNAL OF HYDROLOGY

DOI

https://doi.org/10.1016/j.jhydrol.2020.124707

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Periodic stationarity conditions for periodic autoregressive moving average processes as eigenvalue problems Ula, TA; Smadi, AA (American Geophysical Union (AGU), 1997-08-01) The determination of periodic stationarity conditions for periodic autoregressive moving average (PARMA) processes is a prerequisite to their analysis. Means of obtaining these conditions in analytically simple forms are sought. It is shown that periodic stationarity conditions for univariate and multivariate PARMA processes can always be reduced to eigenvalue problems, which are computationally and analytically easier to deal with. Two different lumpings of the periodic process are considered along this li...
Comparison of prognostic and diagnostic surface flux modeling approaches over the Nile River basin Yılmaz, Mustafa Tuğrul; Zaitchik, Ben; Hain, Chris R.; Crow, Wade T.; Ozdogan, Mutlu; Chun, Jong Ahn; Evans, Jason (American Geophysical Union (AGU), 2014-01-01) Regional evapotranspiration (ET) can be estimated using diagnostic remote sensing models, generally based on principles of energy balance closure, or with spatially distributed prognostic models that simultaneously balance both energy and water budgets over landscapes using predictive equations for land surface temperature and moisture states. Each modeling approach has complementary advantages and disadvantages, and in combination they can be used to obtain more accurate ET estimates over a variety of land...
Accuracy assessment of MODIS daily snow albedo retrievals with in situ measurements in Karasu basin, Turkey Tekeli, AE; Sensoy, A; Sorman, A; Akyürek, Sevda Zuhal; Sorman, U (Wiley, 2006-03-15) Over the ablation period of 2004, daily snow albedo values retrieved from the moderate-resolution imaging spectroradiometer (MODIS) Terra were compared with ground-based albedo measurements. Two data sets are used for this study. The first data set is from two automatic weather stations (AWS) located at fixed points in Karasu basin in eastern Turkey. This provided the temporal assessment of MODIS daily snow albedo values. The second data set, consisting of 19 observation points randomly distributed around o...
Climate change impacts on meteorological drought using SPI and SPEI: case study of Ankara, Turkey MEHR, ALI DANANDEH; Sorman, Ali Unal; Kahya, Ercan; Afshar, Mahdı Hesamı (Informa UK Limited, 2019-11-27) Using regionally downscaled and adjusted outputs of three global climate models (GCMs), meteorological drought analysis was accomplished across Ankara, the capital city of Turkey. To this end, standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI) were projected under (representative concentration pathway) RCP4.5 and RCP8.5 greenhouse gas scenarios. In general, our results show that Ankara experienced six severe and two extreme drought events during the referen...
Effectiveness of combined sewer overflow treatment for dissolved oxygen improvement in the Chicago Waterways Alp, Emre; ZHANG, HENG; Lanyon, R. (IWA Publishing, 2007-01-01) An Use Attainability Analysis (UAA) has been initiated to evaluate what water-quality standards can be achieved in the Chicago Waterway System (CWS). There are nearly 200 combined sewer overflow (CSO) locations discharging to the CWS by gravity. Three CSO pumping stations also drain approximately 140 km(2). Because of the dynamic nature of the CWS the DUFLOW model that is capable of simulating hydraulics and water-quality processes under unsteady-flow conditions was used to evaluate the effectiveness of wat...

Citation Formats

M. Amjad, M. T. Yılmaz, İ. Yücel, and K. K. Yılmaz, “Performance evaluation of satellite- and model-based precipitation products over varying climate and complex topography,” JOURNAL OF HYDROLOGY, pp. 0–0, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/34734.