scholarly journals Impact of Long-Range Dust Transport on Northern California in Spring 2002

2005 ◽  
Author(s):  
P Cameron-Smith ◽  
D Bergmann ◽  
C Chuang ◽  
G Bench ◽  
S Cliff ◽  
...  
Keyword(s):  
Long Range ◽  
Northern California ◽  
Dust Transport

scholarly journals Asian Long-Range Transport in Relation to Atmospheric Rivers in Northern California

Atmosphere ◽  
2019 ◽  
Vol 10 (6) ◽  
pp. 313
Author(s):  
Catherine N. Liu ◽  
Sen Chiao ◽  
Ju-Mee Ryoo
Keyword(s):  
Long Range ◽  
Cold Season ◽  
Asian Dust ◽  
Long Range Transport ◽  
Back Trajectory ◽  
Northern California ◽  
Atmospheric Rivers ◽  
Back Trajectory Analysis ◽  
Range Transport ◽  
Moderate Resolution Imaging Spectroradiometer

The study investigates the effect of aerosol long-range transport on precipitation over Northern California during atmospheric river (AR) events in the 2017 cold season (January–April). ARs in 2017 were one of the strongest to date, and the intense precipitation associated with the ARs resulted in flooding, destruction of property, and contamination of water supplies. The Aerosol Optical Depth (AOD) from Moderate Resolution Imaging Spectroradiometer (MODIS) data shows Asian dust traveling across the Northern Pacific Ocean along with AR events. Aerosol measurements in California, provided by the Interagency Monitoring of Protected Visual Environments (IMPROVE), show that more Asian dust tends to be observed over the coast, while non-Asian/localized dust is observed inland. A mixture of Asian and localized dust is observed over the mountains, although higher amounts of both are observed in the spring (March–April). Back trajectory analysis confirms that Asian aerosols are transported along the air parcels, and each AR event has its own transport pattern in terms of horizontal advection and vertical lifting. Correlation between precipitation and aerosols is low. This suggests that aerosols contribute little to the decrease of local precipitation during the 2017 AR events.

scholarly journals Cloud macro-physical properties in Saharan dust laden and dust free North Atlantic trade wind regimes: A lidar study

2019 ◽  
Author(s):  
Manuel Gutleben ◽  
Silke Groß ◽  
Martin Wirth
Keyword(s):  
Physical Properties ◽  
Long Range ◽  
Climate Models ◽  
Airborne Lidar ◽  
Saharan Dust ◽  
Radiation Budget ◽  
Trade Wind ◽  
Height Distribution ◽  
Dust Transport ◽  
Shallow Marine

Abstract. Saharan dust is known to have an important impact on the atmospheric radiation budget, both directly and indirectly by changing cloud properties. However, up to now it is still an open question if elevated and long-range transported Saharan dust layers have an effect on subjacent marine trade wind cloud occurrence. Shallow trade wind clouds have a significant impact on the Earth's radiation budget and still introduce large uncertainties in climate sensitivity estimates, because of their poor representation in climate models. The Next-generation Aircraft Remote-Sensing for Validation studies (NARVAL) aimed at providing a better understanding of shallow marine trade wind clouds and their interplay with long-range transported elevated Saharan dust layers. Two airborne campaigns were conducted – the first one in December 2013 and the second one in August 2016; the latter one during the peak season of transatlantic Saharan dust transport. Airborne lidar measurements in the vicinity of Barbados performed during the second field campaign are used to investigate possible differences between shallow marine cloud macro-physical properties in dust-free regions and regions comprising elevated Saharan dust layers. The cloud top height distribution derived in dust-laden regions differs from the one derived in dust-free regions and indicates that clouds are shallower and convective development is suppressed. Furthermore, regions comprising elevated Saharan dust layers show a larger fraction of small clouds and larger cloud free regions, compared to dust-free regions. The cloud fraction in dusty regions is only 14 % compared to a fraction of 31 % in dust-free regions. Moreover, a decreasing trend of cloud fractions and cloud top heights with increasing dust layer vertical extent as well as aerosol optical depth is found.

scholarly journals EARLINET observations of the 14–22-May long-range dust transport event during SAMUM 2006: validation of results from dust transport modelling

Tellus B ◽  
2009 ◽  
Vol 61 (1) ◽  
pp. 325-339 ◽  
Author(s):  
D. MüLLER ◽  
B. Heinold ◽  
M. Tesche ◽  
I. Tegen ◽  
D. Althausen ◽  
...  
Keyword(s):  
Long Range ◽  
Transport Modelling ◽  
Dust Transport ◽  
Validation Of Results

Impact of long-range desert dust transport on hydrometeor formation over coastal East Asia

2016 ◽  
Vol 34 (1) ◽  
pp. 101-115 ◽  
Author(s):  
Zhenxi Zhang ◽  
Wen Zhou ◽  
Mark Wenig ◽  
Liangui Yang
Keyword(s):  
East Asia ◽  
Long Range ◽  
Dust Transport ◽  
Desert Dust

scholarly journals Impacts of transported background ozone on California air quality during the ARCTAS-CARB period – a multi-scale modeling study

2010 ◽  
Vol 10 (5) ◽  
pp. 12079-12131 ◽  
Author(s):  
M. Huang ◽  
G. R. Carmichael ◽  
B. Adhikary ◽  
S. N. Spak ◽  
S. Kulkarni ◽  
...  
Keyword(s):  
Air Quality ◽  
Long Range ◽  
Atmospheric Chemistry ◽  
Temporal Variations ◽  
Eastern Pacific ◽  
Long Range Transport ◽  
Northern California ◽  
Multi Scale ◽  
Background Ozone ◽  
Range Transport

Abstract. Multi-scale tracer and full-chemistry simulations with the STEM atmospheric chemistry model are used to analyze the effects of transported background ozone (O3) from the eastern Pacific on California air quality during the ARCTAS-CARB experiment conducted in June 2008. Previous work has focused on the importance of long-range transport of O3 to North America air quality in springtime. However during this summer experiment the long-range transport of O3 is also shown to be important. Simulated and observed O3 transport patterns from the coast to inland northern California are shown to vary based on meteorological conditions and the oceanic O3 profiles, which are strongly episodically affected by Asian inflows. Analysis of the correlations of O3 at various altitudes above the coastal site at Trinidad Head and at a downwind surface site in northern California, show that under long-range transport events, high O3 air-masses (O3>60 ppb) at altitudes between about 2 and 4 km can be transported inland and can significantly influence surface O3 20–30 h later. These results show the importance of characterizing the vertical structure of the lateral boundary conditions (LBC) needed in air quality simulations. The importance of the LBC on O3 prediction during this period is further studied through a series of sensitivity studies using different forms of LBC. It is shown that the use of the LBC downscaled from RAQMS global model that assimilated MLS and OMI data improves the model performance. We also show that the predictions can be further improved through the use of LBC based on NASA DC-8 airborne observations during the ARCTAS-CARB experiment. These results indicate the need to develop observational strategies to improve the representation of the vertical and temporal variations in the air over the eastern Pacific.

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