Recent research highlights include new sea surface temperature records for the Paleogene and biomarker records for methane cycling and
hydrological changes during past episodes of global warmth.
Because meter - scale suboxic zones occur today within the mobile mud belts of tropical river - dominated continental shelves, such as the Amazon Shelf, we hypothesize that sedimentological and
hydrological changes during the PETM fostered the development of analogous conditions on the Eastern seaboard of North America.
Not exact matches
Hydrological and Climatological
Changes in the Trondheimsfjord / Norway
during the late Holocene inferred from Benthic Stable Isotopes and Dinocyst Assemblages G. Milzer, J. Giraudeau, S. Schmidt, J. Faust, J. Knies, F. Eynaud, C. Rühlemann > Download
Although these
hydrological changes could potentially increase soil water availability in previously snow - covered regions
during the cool low - ET season (34), this effect would likely be outweighed by the influence of warming temperatures (and decreased runoff)
during the warm high - ET season (36, 38), as well as by the increasing occurrence of consecutive years with low precipitation and high temperature (Fig. 4A).
As noted in the TAR (McAvaney et al., 2001), vegetation
change during the mid-Holocene likely triggered
changes in the
hydrological cycle, explaining the wet conditions that prevailed in the Sahel region that were further enhanced by ocean feedbacks (Ganopolski et al., 1998; Braconnot et al., 1999), although soil moisture may have counteracted some of these feedbacks (Levis et al., 2004).
«Consistent with previous analyses (see e.g. Montanari, 2012; Zanchettini et al., 2008),» they write, «our trend detection analysis, which we carried out on long historical series observed for the Po river, does not detect any evidence of a statistically significant
change in the flood hazard along the Po river and supports the stationarity of the
hydrological series
during the period of interest (i.e., last five decades).»
The temporal relationship between the Suess solar cycle and particularly significant 210 yr oscillations in the speleothem δ18O records therefore supports the notion that solar variability played a significant role in driving centennial - scale
changes in the
hydrological cycle in the subtropics
during the Holocene.