By Ilya V. Buynevich, Valentina Yanko-Hombach, Allan S. Gilbert, Ronald E. Martin
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Additional info for Geology and Geoarchaeology of the Black Sea Region: Beyond the Flood Hypothesis (GSA Special Paper 473)
The evidence for Milankovitch forcing of climate changes may be questioned for several reasons. First, there is no evidence that the climate cycles are periodic rather than aperiodic. Core records, both ice and deep sea, suggest that the dominant character is that of a random red-noise process. Second, much of the energy in low-frequency climate change occurs at periods around 100 ka, where the insolation forcing is very weak. The contribution of the Milankovitch periodicities (41,000, 19,000, and 23,000 yr periods) to climate change provides only a small fraction (15%–20%) of total climate variance.
These slices (together with the modern state) are used in this paper to assess the linkage between climate variability and hydrological regime. Modeling extreme Black Sea and Caspian Sea levels of the past 21,000 years A GCM (general circulation model) consists of an atmospheric model interactively coupled to submodels of the ocean, sea ice, land surface, and soil. Models have a typical horizontal resolution ~2°–4° latitude × longitude. Designations of the PMIP GCMs are presented in Kislov and Toropov (2007).
Therefore, experimentally, the Allerød was practically similar to that discussed for the mid-Holocene experiment but with more active radiation forcing. The YD experiment yielded both strong radiation forcing and an SST anomaly in the North Atlantic Ocean. During the Allerød, annual river runoff volume into the Caspian and Black Seas was slightly increased (6%), and during the YD, it was lower (–12%) compared to today. Therefore, it could not cause serious sea-level changes. DISCUSSION The results of climate simulation presented here are important in light of the problem of chronologically correlating paleogeographical events that belong to different regional scales.