Download Geological Exploration of the Southern Rock Creek Valley in by James V. O'Connor PDF

By James V. O'Connor

About The Product

Published by way of the yank Geophysical Union as a part of the Field journey Guidebooks Series.

Rock Creek Park is a unique position for learning geology. based because the urban park in 1890, Rock Creek Park serves as an oasis within the city surroundings. Rock Creek Valley is a steep craggy Piedmont eroded quarter the place you possibly can become aware of the bedrock, stick to the evolution of the autumn Zone,and degree the topographically remoted Coastal simple gravels. determine 1 is the map of the stops to monitor the final geology.

The Rock Creek Valley is a textbook for examine at the early Paleozoic heritage. Metasedimentary and igneous rocks demonstrate the marine and tectonic tales of a proto-Atlantic Ocean. Metamorphic mineralalogy is decided in folds, faults, and fracture structures. Paleozoic tectonics is roofed at the bluffs unconformable through gravels of the Mesozoic and Cenozoic. The Cretaceous ancestral Potomac sediments also are transformed into the reduce elevation sediment deposits of past due Cenozoic age (Miocene ? - Holocene). determine 2 is a common geology map of the District. Rock Creek served as a box web site for the fifth overseas Congress for Geologists in 1891. we'll revisit a few of those self same stops nearly a century later and persist with within the footsteps of the early American pioneers: W. J. McGee, N. H. Darton, A. Keith, G. Williams, and B. Willis.


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In this regard, the Oscillation often 12 Historical perspective [Ch. 1 modulates the large monsoons of the summer hemisphere. Examples for the northern summer are those during MONEX discussed above. Chapters 2, 3, 4, and 5 of this book cover variations in the monsoons in detail. Another seasonal result reveals a role of the v-wind and illustrates the danger in interpreting spectral results of non-stationary time series. Esimates of seasonally varying coherence and phase between u and v-winds in a frequency band centered on 1/47 day at 150 hPa over Chuuk reveal that the coherence is large twice a year.

Stern (2004) The Madden±Julian Oscillation and its impact on Northern Hemisphere weather predictability. Mon. Wea. , 132, 1462±1471. Knutsen, T. , K. M. Weickmann, and J. E. Kutzbach (1986) Global-scale intraseasonal oscillations of outgoing longwave radiation and 250 mb zonal wind during northern hemisphere summer. Mon. Wea. , 114, 605±623. Krishnamurti, T. , D. K. Oosterhof, and A. V. Mehta (1988) Air±sea interaction on the time scale of 30 to 50 days. J. Atmos. , 45, 1304±1322. -M. and T. J.

Their model favored more realistic large-scale convection and the eastward propagating Kelvin wave part of the response. To get the relatively slow propagation, the heating pro®le they used had what is likely an unrealistic maximum at low tropospheric levels. , 1987). Here, surface winds of the large-scale wave a€ect ¯uxes of latent heat from the ocean to preferably support new convection to the east of old. Unfortunately, WISHE favors smaller scale convection just as traditional CISK does. None of these theories explain all of the complex features of the MJO.

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