Flood detection using Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage and extreme precipitation data

Abstract

Abstract. A complete global flood event record would aid researchers to analyze the distribution of global floods and, thus, better formulate and manage disaster prevention and reduction policies. This study used Gravity Recovery and Climate Experiment (GRACE) terrestrial water storage and precipitation data combined with high-frequency filtering, anomaly detection and flood potential index methods to successfully extract historical flood days globally between 1 April 2002 and 31 August 2016; these results were then further compared and validated with Dartmouth Flood Observatory (DFO) data, Global Runoff Data Centre (GRDC) discharge data, news reports and social media data. The results showed that GRACE-based flood days could cover 81 % of the flood events in the DFO database, 87 % of flood events extracted by MODIS and supplement many additional flood events not recorded by the DFO. Moreover, the probability of detection greater than or equal to 0.5 reached 62 % among 261 river basins compared to flood events derived from the GRDC discharge data. These detection capabilities and detection results are both good. Finally, we provided flood day products with a 1∘ spatial resolution covering the range between 60∘ S and 60∘ N from 1 April 2002 to 31 August 2016; these products can be obtained from https://doi.org/10.5281/zenodo.6831384 (Zhang et al., 2022b). Thus, this research contributes a data foundation for the mechanistic analysis and attribution of global flood events.

A Regionally Refined and Mass‐Consistent Atmospheric and Hydrological De‐Aliasing Product for GRACE, GRACE‐FO and Future Gravity Missions

“…The impact of extreme events on GRACE observations has been investigated solely looking at the contribution of hydrology in terms of TWS changes, either by analyzing estimated sub‐monthly gravity fields (Nie et al., 2023; Save et al., 2016; Zhang et al., 2023) or by studying range‐rate observations (Ghobadi‐Far et al., 2022; Han et al., 2021; Li et al., 2023). In this paper, we moved a step further and investigated water mass anomalies that occur during extreme events before, in the form of precipitation, atmospheric water flux increases hydrological storage.…”

A regionally refined and mass-consistent atmospheric and hydrological de-aliasing product for GRACE, GRACE-FO and future gravity missions

“…The impact of extreme events on GRACE observations has been investigated solely looking at the contribution of hydrology in terms of TWS changes, either by analyzing estimated sub-monthly gravity fields (Save et al, 2016;Nie et al, 2023;Zhang et al, 2023) or by studying range-rate observations (Li et al, 2023;Han et al, 2021;Ghobadi-Far et al, 2022). In this paper, we moved a step further and investigated water mass anomalies that occur during extreme events before, in the form of precipitation, atmospheric water flux increases hydrological storage.…”

The Asymmetric Effects of Extreme Climate Risk Perception on Coal Futures Return Dynamics: Evidence from Nonparametric Causality-In-Quantiles Tests

“…Due to human-made greenhouse gas emissions, extreme climate events occur more frequently, last longer, and become more fierce, resulting in drought, extreme cold, rising sea levels, and drastic changes in precipitation [4]. According to observations from NASA's Gravity Recovery and Climate Experiment (GRACE), the impacts of extreme climate events on economies and societies around the world are increasingly deepening, forcing many countries and organizations to take emergent actions and response measures [5]. The crux of the matter is to restrain the combustion and utilization of fossil fuels, such as coal, oil, and natural gas, so that greenhouse gas emissions can be minimized as much as possible [6][7][8][9][10].…”