scholarly journals Temporal distribution of the potentially toxic diatom Pseudonitzschia australis at a coastal site in Southern California

1994 ◽  
Vol 104 ◽  
pp. 309-312 ◽  
Author(s):  
CB Lange ◽  
FMH Reid ◽  
M Vernet
Keyword(s):  
Southern California ◽  
Temporal Distribution ◽  
Coastal Site ◽  
Pseudonitzschia Australis

Spatio-temporal distribution of beaked whales in southern California waters

2014 ◽  
Vol 136 (4) ◽  
pp. 2073-2073
Author(s):  
Simone Baumann-Pickering ◽  
Jennifer S. Trickey ◽  
Marie A. Roch ◽  
Sean M. Wiggins
Keyword(s):  
Southern California ◽  
Temporal Distribution ◽  
Beaked Whales ◽  
Spatio Temporal

scholarly journals Air Pollution Distribution Patterns in the San Bernardino Mountains of Southern California: a 40-Year Perspective

2007 ◽  
Vol 7 ◽  
pp. 98-109 ◽  
Author(s):  
Andrzej Bytnerowicz ◽  
Michael Arbaugh ◽  
Susan Schilling ◽  
Witold Fraczek ◽  
Diane Alexander ◽  
...  
Keyword(s):  
Los Angeles ◽  
Southern California ◽  
Temporal Distribution ◽  
Distribution Patterns ◽  
N Deposition ◽  
Conifer Forest ◽  
Acid Vapor ◽  
San Bernardino Mountains ◽  
Mixed Conifer Forest ◽  
San Bernardino

Since the mid-1950s, native pines in the San Bernardino Mountains (SBM) in southern California have shown symptoms of decline. Initial studies in 1963 showed that ozone (O3) generated in the upwind Los Angeles Basin was responsible for the injury and decline of sensitive trees. Ambient O3decreased significantly by the mid-1990s, resulting in decreased O3injury and improved tree growth. Increased growth of trees may also be attributed to elevated atmospheric nitrogen (N) deposition. Since most of the N deposition to mixed conifer forest stands in the SBM results from dry deposition of nitric acid vapor (HNO3) and ammonia (NH3), characterization of spatial and temporal distribution of these two pollutants has become essential. Although maximum daytime O3concentrations over last 40 years have significantly decreased (~3-fold), seasonal means have been reduced much less (~1.5-fold), with 2-week long means occasionally exceeding 100 ppb in the western part of the range. In the same area, significantly elevated concentrations of HNO3and NH3, up to 17.5 and 18.5 μg/m3as 2-week averages, respectively, have been determined. Elevated levels of O3and increased N deposition together with long-term drought predispose the SBM forests to massive bark beetle attacks making them susceptible to catastrophic fires.

Spatial and temporal distribution of contaminated, effluent-affected sediment on the Palos Verdes margin, southern California

2002 ◽  
Vol 22 (6-7) ◽  
pp. 859-880 ◽  
Author(s):  
Homa J. Lee ◽  
Christopher R. Sherwood ◽  
David E. Drake ◽  
Brian D. Edwards ◽  
Florence Wong ◽  
...  
Keyword(s):  
Southern California ◽  
Temporal Distribution ◽  
Spatial And Temporal Distribution

scholarly journals Drought onset and propagation into soil moisture and grassland vegetation responses during the 2012–2019 major drought in Southern California

2021 ◽  
Vol 25 (6) ◽  
pp. 3713-3729
Author(s):  
Maria Magdalena Warter ◽  
Michael Bliss Singer ◽  
Mark O. Cuthbert ◽  
Dar Roberts ◽  
Kelly K. Caylor ◽  
...  
Keyword(s):  
Climate Change ◽  
Soil Moisture ◽  
Sierra Nevada ◽  
Rainy Season ◽  
Southern California ◽  
Severe Drought ◽  
Climate Change Scenarios ◽  
Evaporative Demand ◽  
Coastal Site ◽  
Vegetation Responses

Abstract. Despite clear signals of regional impacts of the recent severe drought in California, e.g., within Californian Central Valley groundwater storage and Sierra Nevada forests, our understanding of how this drought affected soil moisture and vegetation responses in lowland grasslands is limited. In order to better understand the resulting vulnerability of these landscapes to fire and ecosystem degradation, we aimed to generalize drought-induced changes in subsurface soil moisture and to explore its effects within grassland ecosystems of Southern California. We used a high-resolution in situ dataset of climate and soil moisture from two grassland sites (coastal and inland), alongside greenness (Normalized Difference Vegetation Index) data from Landsat imagery, to explore drought dynamics in environments with similar precipitation but contrasting evaporative demand over the period 2008–2019. We show that negative impacts of prolonged precipitation deficits on vegetation at the coastal site were buffered by fog and moderate temperatures. During the drought, the Santa Barbara region experienced an early onset of the dry season in mid-March instead of April, resulting in premature senescence of grasses by mid-April. We developed a parsimonious soil moisture balance model that captures dynamic vegetation–evapotranspiration feedbacks and analyzed the links between climate, soil moisture, and vegetation greenness over several years of simulated drought conditions, exploring the impacts of plausible climate change scenarios that reflect changes to precipitation amounts, their seasonal distribution, and evaporative demand. The redistribution of precipitation over a shortened rainy season highlighted a strong coupling of evapotranspiration to incoming precipitation at the coastal site, while the lower water-holding capacity of soils at the inland site resulted in additional drainage occurring under this scenario. The loss of spring rains due to a shortening of the rainy season also revealed a greater impact on the inland site, suggesting less resilience to low moisture at a time when plant development is about to start. The results also suggest that the coastal site would suffer disproportionally from extended dry periods, effectively driving these areas into more extreme drought than previously seen. These sensitivities suggest potential future increases in the risk of wildfires under climate change, as well as increased grassland ecosystem vulnerability.

The Effects of Presentation on Noise and Dental Appliances on Speech

1981 ◽  
Vol 24 (1) ◽  
pp. 151-151
Author(s):  
Lillian Glass ◽  
Sharon R. Garber ◽  
T. Michael Speidel ◽  
Gerald M. Siegel ◽  
Edward Miller
Keyword(s):  
Southern California ◽  
University Of Southern California ◽  
University Of Minnesota ◽  
School Of Medicine ◽  
Southern California School ◽  
School Of Dentistry ◽  
The University

An omission in the Table of Contents, December JSHR, has occurred. Lillian Glass, Ph.D., at the University of Southern California School of Medicine and School of Dentistry, was a co-author of the article "The Effects of Presentation on Noise and Dental Appliances on Speech" along with Sharon R. Garber, T. Michael Speidel, Gerald M. Siegel, and Edward Miller of the University of Minnesota, Minneapolis.

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