Hydrodynamics and Marine Optics during Cold Fronts at Santa Rosa Island, Florida

There is growing evidence for human use of geophytes long before the advent of agriculture. Rich in carbohydrates, geophytes were important in many coastal areas where protein-rich marine foods are abundant. On California's Channel Islands, scholars have long questioned how maritime peoples sustained themselves for millennia with limited plant resources. Recent research demonstrates that geophytes were heavily used on the islands for 10,000 years, and here we describe geophyte and other archaeobotanical remains from an approximately 11,500-year-old site on Santa Rosa Island. Currently the earliest evidence for geophyte consumption in North America, our data extend geophyte use on the Channel Islands by roughly 1,500 years and document a diverse and balanced economy for early Paleocoastal peoples. Experimental return rates for a key island geophyte support archaeological evidence that the corms of blue dicks (Dipterostemon capitatus) were a high-ranked staple resource throughout the Holocene.

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A Numerical Investigation of Wave‐Supported Gravity Flow During Cold Fronts Over the Atchafalaya Shelf

Journal of Geophysical Research Oceans ◽

10.1029/2019jc015269 ◽

2020 ◽

Vol 125 (9) ◽

Author(s):

Zhengchen Zang ◽

Z. George Xue ◽

Kehui Xu ◽

Celalettin E. Ozdemir ◽

Qin Chen ◽

...

Keyword(s):

Numerical Investigation ◽

Gravity Flow ◽

Cold Fronts ◽

Atchafalaya Shelf

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Sargassum on Santa Rosa Island, Florida: faunal use and beachgoer perception

Journal of Coastal Conservation ◽

10.1007/s11852-016-0472-6 ◽

2016 ◽

Vol 21 (1) ◽

pp. 63-83 ◽

Cited By ~ 2

Author(s):

Julie Ann Schultz Schiro ◽

Klaus J. Meyer-Arendt ◽

Sherry K. Schneider

Keyword(s):

Santa Rosa Island

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A CloudSat–CALIPSO View of Cloud and Precipitation Properties across Cold Fronts over the Global Oceans

Journal of Climate ◽

10.1175/jcli-d-15-0052.1 ◽

2015 ◽

Vol 28 (17) ◽

pp. 6743-6762 ◽

Cited By ~ 24

Author(s):

Catherine M. Naud ◽

Derek J. Posselt ◽

Susan C. van den Heever

Keyword(s):

Large Scale ◽

Cold Front ◽

Conveyor Belt ◽

Low Level ◽

Scale Parameters ◽

Convective Clouds ◽

Cold Fronts ◽

Surface Front ◽

High Level ◽

The Impact

Abstract The distribution of cloud and precipitation properties across oceanic extratropical cyclone cold fronts is examined using four years of combined CloudSat radar and CALIPSO lidar retrievals. The global annual mean cloud and precipitation distributions show that low-level clouds are ubiquitous in the postfrontal zone while higher-level cloud frequency and precipitation peak in the warm sector along the surface front. Increases in temperature and moisture within the cold front region are associated with larger high-level but lower mid-/low-level cloud frequencies and precipitation decreases in the cold sector. This behavior seems to be related to a shift from stratiform to convective clouds and precipitation. Stronger ascent in the warm conveyor belt tends to enhance cloudiness and precipitation across the cold front. A strong temperature contrast between the warm and cold sectors also encourages greater post-cold-frontal cloud occurrence. While the seasonal contrasts in environmental temperature, moisture, and ascent strength are enough to explain most of the variations in cloud and precipitation across cold fronts in both hemispheres, they do not fully explain the differences between Northern and Southern Hemisphere cold fronts. These differences are better explained when the impact of the contrast in temperature across the cold front is also considered. In addition, these large-scale parameters do not explain the relatively large frequency in springtime postfrontal precipitation.

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