A re-examination of perpendicular drought indices over Central and Southwest Asia

2012 ◽  
Author(s):  
Alireza Shahabfar ◽  
Maximilian Reinwand ◽  
Christopher Conrad ◽  
Gunther Schorcht
Author(s):  
Ondrej Ledvinka ◽  
◽  
Pavel Coufal ◽  

The territory of Czechia currently suffers from a long-lasting drought period which has been a subject of many studies, including the hydrological ones. Previous works indicated that the basin of the Morava River, a left-hand tributary of the Danube, is very prone to the occurrence of dry spells. It also applies to the development of various hydrological time series that often show decreases in the amount of available water. The purpose of this contribution is to extend the results of studies performed earlier and, using the most updated daily time series of discharge, to look at the situation of the so-called streamflow drought within the basin. 46 water-gauging stations representing the rivers of diverse catchment size were selected where no or a very weak anthropogenic influences are expected and the stability and sensitivity of profiles allow for the proper measurement of low flows. The selected series had to cover the most current period 1981-2018 but they could be much longer, which was considered beneficial for the next determination of the development direction. Various series of drought indices were derived from the original discharge series. Specifically, 7-, 15- and 30-day low flows together with deficit volumes and their durations were tested for trends using the modifications of the Mann– Kendall test that account for short-term and long-term persistence. In order to better reflect the drivers of streamflow drought, the indices were considered for summer and winter seasons separately as well. The places with the situation critical to the future water resources management were highlighted where substantial changes in river regime occur probably due to climate factors. Finally, the current drought episode that started in 2014 was put into a wider context, making use of the information obtained by the analyses.


Author(s):  
Jayson Gonzales Sae-Saue
Keyword(s):  

2011 ◽  
Vol 19 (4) ◽  
pp. 860-865
Author(s):  
Xi-Yan KANG ◽  
Guang-Qin GU ◽  
Yin-Shan SHI ◽  
Guo-Qiang TIAN ◽  
Yong-Li GU

Author(s):  
David Kaniewski ◽  
Elise Van Campo

The collapse of Bronze Age civilizations in the Aegean, southwest Asia, and the eastern Mediterranean 3200 years ago remains a persistent riddle in Eastern Mediterranean archaeology, as both archaeologists and historians believe the event was violent, sudden, and culturally disruptive. In the first phase of this period, many cities between Pylos and Gaza were destroyed violently and often left unoccupied thereafter. The palace economy of the Aegean Region and Anatolia that characterized the Late Bronze Age was replaced by the isolated village cultures of the Dark Ages. Earthquakes, attacks of the Sea Peoples, and socio-political unrest are among the most frequently suggested causes for this phenomenon. However, while climate change has long been considered a potential prime factor in this crisis, only recent studies have pinpointed the megadrought behind the collapse. An abrupt climate shift seems to have caused, or hastened, the fall of the Late Bronze Age world by sparking political and economic turmoil, migrations, and famines. The entirety of the megadrought’s effects terminated the Late Bronze Age in the eastern Mediterranean.


2018 ◽  
Vol 14 (12) ◽  
pp. 1915-1960 ◽  
Author(s):  
Rudolf Brázdil ◽  
Andrea Kiss ◽  
Jürg Luterbacher ◽  
David J. Nash ◽  
Ladislava Řezníčková

Abstract. The use of documentary evidence to investigate past climatic trends and events has become a recognised approach in recent decades. This contribution presents the state of the art in its application to droughts. The range of documentary evidence is very wide, including general annals, chronicles, memoirs and diaries kept by missionaries, travellers and those specifically interested in the weather; records kept by administrators tasked with keeping accounts and other financial and economic records; legal-administrative evidence; religious sources; letters; songs; newspapers and journals; pictographic evidence; chronograms; epigraphic evidence; early instrumental observations; society commentaries; and compilations and books. These are available from many parts of the world. This variety of documentary information is evaluated with respect to the reconstruction of hydroclimatic conditions (precipitation, drought frequency and drought indices). Documentary-based drought reconstructions are then addressed in terms of long-term spatio-temporal fluctuations, major drought events, relationships with external forcing and large-scale climate drivers, socio-economic impacts and human responses. Documentary-based drought series are also considered from the viewpoint of spatio-temporal variability for certain continents, and their employment together with hydroclimate reconstructions from other proxies (in particular tree rings) is discussed. Finally, conclusions are drawn, and challenges for the future use of documentary evidence in the study of droughts are presented.


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