067 DEAN, W. E., BRADBURY, J. P., ANDERSON, R. Y. , and BARNOSKY, C. W. 



1984. "The Variability of Holocene Climate Change: Evidence From Varved Lake 



Sediments," Science . Vol 226, No. 4679, pp 1191-1194. 



Varved sediments from a lake near the present forest-prairie border in 

 northwestern Minnesota provide an annual record of climate change for the last 

 10,400 years. Climate-sensitive mineral, chemical, and biological components 

 show that the mid-Holocene dry interval between 8,500 and 4,000 years ago is 

 asymmetrical and actually consists of two distinct drier pulses separated by a 

 moister interval that lasted about 600 years. Cyclic fluctuations with 



periods of several hundred years were abrupt and persistent throughout the 

 Holocene and are most clearly recorded within the two drier pulses. 

 (Authors) . 



068 DELAUNE, R. D., BAUMAN, R. H., and GOSSELINK, J. G. 1983. 

 "Relationships Among Vertical Accretion, Coastal Submergence, and Erosion in a 

 Louisiana Gulf Coast Marsh," Journal of Sedimentary Petrology . Vol 53, No. 1, 

 pp 0147-0157. 



Vertical accretion in a southwest Louisiana Spartina patens brackish 

 marsh has not kept pace with coastal submergence during the past three 

 decades. The rate of accretion determined from 137 Cs dating and the use of 

 artificial marker horizons averaged 0.8 cm/year., whereas coastal submergence 

 obtained from tide-gage data averaged 1.2 cm/year. Conversion from marsh to 

 open-water bodies closely paralleled the increase in coastal submergence. If 

 resulting aggravation deficit continues, the marsh will likely complete its 

 transformation to an open bay in less than 40 years. In view of recent pro- 

 jections of increasing sea-level rise and results presented may foreshadow a 

 more widespread phenomenon. (Authors) . 



069 DE MESQUITA, A. R. , FRANCO, A. S. and HARARI , J. 1986. "On Mean Sea- 

 Level Along the Brazilian Coast," Geophysical Journal. Royal Astronomical 

 Society , pp 67-77. 



Fourier analyses of mean monthly sea-level data from Belem, Fortaleza, 

 Salvador and Imbituba, ports on the Brazilian coast, are made with 

 simultaneous data of air temperature, sea surface atmospheric pressure, 

 atmospheric precipitation and evaporation. Results show that the mean monthly 

 sea-levels of ports below Recife's latitude show peaks in February-March and 

 April-May which are apparently related to the seasonal temperature changes and 

 the combined action of precipitation, winds and oceanographic large-scale 

 changes. The port of Belem showed a stronger semi-annual seasonal component, 

 which seems to be related to the atmospheric precipitation. (Authors) . 



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