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Physical oceanography, food chains, and fish stocks: a review 总被引:10,自引:2,他引:10
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Hilmar von Eynatten Thomas Voigt Angela Meier Hans-Joachim Franzke Reinhard Gaupp 《International Journal of Earth Sciences》2008,97(6):1315-1330
The Harz Mountains and the adjacent Subhercynian Cretaceous Basin figure as the most prominent surface representative for
Late Cretaceous inversion structures in Central Europe. Facies, depositional architecture and provenance of the basin fill
reflect mechanisms and timing of the exhumation of the Harz. From Hauterivian to Early Santonian there is no evidence for
detrital input from the nearby Harz area. Sediments are mature quartzarenites derived from Paleozoic basement rocks and/or
recycled Permian to Mesozoic sedimentary rocks. This situation changed drastically in Middle to Late Santonian when freshly
exhumed and eroded Mesozoic sedimentary cover rocks of the Harz were delivered into the basin. Feldspar and lithoclasts reflect
erosion of Triassic and, in places, Jurassic to Turonian strata. Apatite and garnet in heavy mineral spectra are derived from
largely unweathered Lower Triassic Buntsandstein as indicated by apatite and garnet chemistry. In Early Campanian, Paleozoic
lithoclasts indicate erosion cutting down into the basement of the Harz. Simultaneous strong decrease of feldspar, garnet
and apatite suggest an almost complete removal of the 2–3 km thick Mesozoic cover of the Harz within only 2–4 Myr. This translates
into an exhumation rate of approximately 1 mm/a consistent with apatite fission track data from granitoid rocks of the Harz
Mountains. 相似文献
119.
Through the analysis of ensembles of coupled model simulations and projections collected from CMIP3 and CMIP5, we demonstrate that a fundamental spatial scale limit might exist below which useful additional refinement of climate model predictions and projections may not be possible. That limit varies among climate variables and from region to region. We show that the uncertainty (noise) in surface temperature predictions (represented by the spread among an ensemble of global climate model simulations) generally exceeds the ensemble mean (signal) at horizontal scales below 1000 km throughout North America, implying poor predictability at those scales. More limited skill is shown for the predictability of regional precipitation. The ensemble spread in this case tends to exceed or equal the ensemble mean for scales below 2000 km. These findings highlight the challenges in predicting regionally specific future climate anomalies, especially for hydroclimatic impacts such as drought and wetness. 相似文献
120.
Suryendu Dutta Monalisa Mallick Runcie Paul Mathews Ulrich Mann Paul F. Greenwood Rakesh Saxena 《Journal of Earth System Science》2010,119(5):711-716
The terpenoid composition of resins from the Miocene lignite horizons from the Kerala-Konkan Coast, western India was analyzed
by Curie-point pyrolysis-gas chromatography-mass spectrometry (Cupy-GC-MS). The major pyrolysates were cadalene-based bicyclic
sesquiterpenoids including some C30-C31 bicadinenes and bicadinanes typical of dammar resin from angiosperm plants of Dipterocarpaceae family. These plants are typically
supported by tropical climates which the western Indian region was known to have experienced during early Tertiary period.
The present study suggests that these palaeoclimatic conditions persisted until at least the Miocene epoch. These sesquiterpenoids
which are commonly detected in many SE Asian crude oils may be utilised as useful biomarkers for petroleum exploration in
the western Indian region. 相似文献