TY  - JOUR
A1  - Traxl, Dominik
A1  - Boers, Niklas
A1  - Rheinwalt, Aljoscha
A1  - Goswami, Bedartha
A1  - Kurths, Jürgen
T1  - The size distribution of spatiotemporal extreme rainfall clusters around the globe
JF  - Geophysical research letters
N2  - The scaling behavior of rainfall has been extensively studied both in terms of event magnitudes and in terms of spatial extents of the events. Different heavy-tailed distributions have been proposed as candidates for both instances, but statistically rigorous treatments are rare. Here we combine the domains of event magnitudes and event area sizes by a spatiotemporal integration of 3-hourly rain rates corresponding to extreme events derived from the quasi-global high-resolution rainfall product Tropical Rainfall Measuring Mission 3B42. A maximum likelihood evaluation reveals that the distribution of spatiotemporally integrated extreme rainfall cluster sizes over the oceans is best described by a truncated power law, calling into question previous statements about scale-free distributions. The observed subpower law behavior of the distribution's tail is evaluated with a simple generative model, which indicates that the exponential truncation of an otherwise scale-free spatiotemporal cluster size distribution over the oceans could be explained by the existence of land masses on the globe.
Y1  - 2016
U6  - https://doi.org/10.1002/2016GL070692
SN  - 0094-8276
SN  - 1944-8007
VL  - 43
SP  - 9939
EP  - 9947
PB  - American Geophysical Union
CY  - Washington
ER  - 
TY  - JOUR
A1  - Lechleitner, Franziska A.
A1  - Baldini, James U. L.
A1  - Breitenbach, Sebastian Franz Martin
A1  - Fohlmeister, Jens Bernd
A1  - McIntyre, Cameron
A1  - Goswami, Bedartha
A1  - Jamieson, Robert A.
A1  - van der Voort, Tessa S.
A1  - Prufer, Keith
A1  - Marwan, Norbert
A1  - Culleton, Brendan J.
A1  - Kennett, Douglas J.
A1  - Asmerom, Yemane
A1  - Polyak, Victor
A1  - Eglinton, Timothy I.
T1  - Hydrological and climatological controls on radiocarbon concentrations in a tropical stalagmite
JF  - Geochimica et cosmochimica acta : journal of the Geochemical Society and the Meteoritical Society
N2  - Precisely-dated stalagmites are increasingly important archives for the reconstruction of terrestrial paleoclimate at very high temporal resolution. In-depth understanding of local conditions at the cave site and of the processes driving stalagmite deposition is of paramount importance for interpreting proxy signals incorporated in stalagmite carbonate. Here we present a sub-decadally resolved dead carbon fraction (DCF) record for a stalagmite from Yok Balum Cave (southern Belize). The record is coupled to parallel stable carbon isotope (delta C-13) and U/Ca measurements, as well as radiocarbon (C-14) measurements from soils overlying the cave system. Using a karst carbon cycle model we disentangle the importance of soil and karst processes on stalagmite DCF incorporation, revealing a dominant host rock dissolution control on total DCF. Covariation between DCF, delta C-13, and U/Ca indicates that karst processes are a common driver of all three parameters, suggesting possible use of delta C-13 and trace element ratios to independently quantify DCF variability. A statistically significant multi-decadal lag of variable length exists between DCF and reconstructed solar activity, suggesting that solar activity influenced regional precipitation in Mesoamerica over the past 1500 years, but that the relationship was non-static. Although the precise nature of the observed lag is unclear, solar-induced changes in North Atlantic oceanic and atmospheric dynamics may play a role. (C) 2016 Elsevier Ltd. All rights reserved.
KW  - Stalagmite
KW  - Tropics
KW  - Radiocarbon
KW  - Trace elements
KW  - Hydroclimate
Y1  - 2016
U6  - https://doi.org/10.1016/j.gca.2016.08.039
SN  - 0016-7037
SN  - 1872-9533
VL  - 194
SP  - 233
EP  - 252
PB  - Elsevier
CY  - Oxford
ER  -