Isentropic trajectory analysis of long range transport over the Pacific

1986 ◽  
Vol 20 (10) ◽  
pp. 2072-2073
Author(s):  
J Merrill ◽  
R Bleck
Keyword(s):  
Long Range ◽  
Trajectory Analysis ◽  
Long Range Transport ◽  
The Pacific ◽  
Range Transport

The long range transport of pollutants in the Pacific Rim region

1990 ◽  
Vol 24 (6) ◽  
pp. 1521-1534 ◽  
Author(s):  
Veerabhadra R Kotamarthi ◽  
Gregory R Carmichael
Keyword(s):  
Long Range ◽  
Pacific Rim ◽  
Long Range Transport ◽  
The Pacific ◽  
Range Transport

scholarly journals Airmass Trajectories and Long Range Transport of Pollutants: Review of Wet Deposition Scenario in South Asia

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Umesh Kulshrestha ◽  
Bablu Kumar
Keyword(s):  
Middle East ◽  
South Asia ◽  
Long Range ◽  
Wet Deposition ◽  
Trajectory Analysis ◽  
Dust Storms ◽  
Anthropogenic Sources ◽  
Long Range Transport ◽  
Pollution Transport ◽  
Range Transport

This paper presents a review of airmass trajectories and their role in air pollution transport. It describes the concept, history, and basic calculation of air trajectories citing various trajectory models used worldwide. It highlights various areas of trajectory applications and errors associated with trajectory calculations. South Asian region receives airmasses from Europe, Middle East, Africa, and Indian Ocean, and so forth, depending upon the season. These airmasses are responsible for export and import of pollutants depositing in nearby states. Trajectory analysis revealed that soil is contributed by the dust storms coming from Oman through Gulf and Iran, while most of black carbon (BC) sources are located in India. A detailed review of trajectories associated with wet deposition events indicated that airmasses coming from Europe and Middle East carry high concentration of acidic pollutants which are deposited in Himalayan ranges. Similarly, trajectory analysis revealed that acidic pollutants from continental anthropogenic sources are transported to an ecosensitive site in Western Ghats in India and the outward fluxes of anthropogenic activities of Indo-Gangetic region are transported towards Bay of Bengal. Hence, transboundary and long range transport of pollutants are very important issues in South Asia which need immediate attention of scientists and policy makers.

scholarly journals Aerosol properties over Interior Alaska from lidar, DRUM Impactor sampler, and OPC-sonde measurements and their meteorological context during ARCTAS-A, April 2008

2013 ◽  
Vol 13 (3) ◽  
pp. 1293-1310 ◽  
Author(s):  
D. E. Atkinson ◽  
K. Sassen ◽  
M. Hayashi ◽  
C. F. Cahill ◽  
G. Shaw ◽  
...  
Keyword(s):  
Long Range ◽  
Trajectory Analysis ◽  
Source Region ◽  
Asian Dust ◽  
Long Range Transport ◽  
Wildfire Smoke ◽  
Aerosol Loading ◽  
Interior Alaska ◽  
Range Transport ◽  
Optical Particle Counter

Abstract. Aerosol loading over Interior Alaska displays a strong seasonality, with pristine conditions generally prevailing during winter months. Long term aerosol research from the University of Alaska Fairbanks indicates that the period around April typically marks the beginning of the transition from winter to summer conditions. In April 2008, the NASA-sponsored "Arctic Research of the Composition of the Troposphere from Aircraft and Satellites" (ARCTAS) field campaign was conducted to analyze incursions of aerosols transported over Alaska and the Canadian North. In and around Fairbanks, Alaska, data concerning aerosol characteristics were gathered by polarization (0.693 μm) lidar, DRUM Impactor sampler, and balloon-borne optical particle counter. These data provide information on the vertical distribution and type of aerosol, their size distributions, the chemical nature of aerosol observed at the surface, and timing of aerosol loading. A detailed synoptic analysis placed these observations into their transport and source-region context. Evidence suggests four major aerosol loading periods in the 25 March–30 April 2008 timeframe: a period during which typical Arctic haze conditions prevailed, several days of extremely clear conditions, rapid onset of a period dominated by Asian dust with some smoke, and a period dominated by Siberian wildfire smoke. A focused case study analysis conducted on 19 April 2008 using a balloon-borne optical particle counter suggests that, on this day, the majority of the suspended particulate matter consisted of coarse mode desiccated aerosol having undergone long-range transport. Backtrack trajectory analysis suggests aged Siberian wildfire smoke. In the last week of April, concentrations gradually decreased as synoptic conditions shifted away from favoring transport to Alaska. An important result is a strong suggestion of an Asian dust incursion in mid-April that was not well identified in other ARCTAS measurements. The lidar and OPC-sonde unambiguously discern aerosols height stratification patterns indicative of long range transport. Identification of a dust component is suggested by DRUM sampler results, which indicate crustal species, and supported by synoptic and trajectory analysis, which indicates both a source-region lifting event and appropriate air-mass pathways.

scholarly journals Climatology in Asian dust activation and transport based on MISR satellite observations and trajectory analysis

2018 ◽  
Author(s):  
Yan Yu ◽  
Olga V. Kalashnikova ◽  
Michael J. Garay ◽  
Michael Notaro
Keyword(s):  
North America ◽  
Long Range ◽  
Trajectory Analysis ◽  
Asian Dust ◽  
Long Range Transport ◽  
Gobi Desert ◽  
The North ◽  
Relative Contribution ◽  
Range Transport ◽  
Transport Patterns

Abstract. Asian dust, primarily emitted from the Taklamakan and Gobi Deserts, has been reported to reach remote destinations, such as North America. However, the relative contribution of the Taklamakan and Gobi Deserts to dust loadings through long-range transport remains unaddressed in any observational study. Here, the climatology of Asian dust activation and transport is investigated using stereo observations of dust sources from the Multiangle Imaging SpectroRadiometer (MISR) instrument combined with observation-initiated trajectory modeling. MISR-derived dust injection height and dust plume motion vectors confirm the peak of dust activation and transport potential in spring over the Gobi Desert and in both spring and summer over the Taklamakan Desert. The long-range transport patterns of Asian dust, including the influence on North America through trans-Pacific transport, are assessed using extensive forward trajectories initiated by MISR dust plume observations. The trajectory analysis reveals latitude-dependent influence of dust from the Taklamakan and Gobi deserts, with Taklamakan dust dominantly affecting to the south of 50° N and Gobi dust primarily affecting to the north of 50° N in North America. The Asian dust activation and transport exhibit substantial seasonal and interannual variability, motivating future studies on the potential drivers.

scholarly journals Trans-Pacific transport and evolution of aerosols and trace gases from Asia during the INTEX-B field campaign

2009 ◽  
Vol 9 (4) ◽  
pp. 16381-16439 ◽  
Author(s):  
B. Adhikary ◽  
G. R. Carmichael ◽  
S. Kulkarni ◽  
C. Wei ◽  
Y. Tang ◽  
...  
Keyword(s):  
Boundary Conditions ◽  
Long Range ◽  
Biomass Burning ◽  
Meteorological Parameters ◽  
Trace Gases ◽  
Long Range Transport ◽  
Model Calculations ◽  
The Pacific ◽  
Range Transport ◽  
The Impact

Abstract. The Sulfur Transport and dEposition Model (STEM) developed at the University of Iowa is applied to the analysis of observations obtained during the Intercontinental Chemical Transport Experiment-Phase B (INTEX-B), conducted over the Pacific Ocean during the 2006 North American spring season. This paper reports on the model performance of meteorological parameters, trace gases, aerosols and photolysis rate (J-values) predictions with the NASA DC-8 and NSF/NCAR C-130 airborne measurements along with observations from three surface sites Mt. Bachelor, Trinidad Head and Kathmandu, Nepal. In general the model shows appreciable skill in predicting many of the important aspects of the observed distributions. The major meteorological parameters driving long range transport are accurately predicted by the WRF simulations used in this study. Furthermore, the STEM model predicts aerosols and trace gases concentrations within a standard deviation of most of the observed mean values. The results also point towards areas where model improvements are needed; e.g., the STEM model underestimates CO (15% for the DC8 and 6% for the C-130), whereas it overpredicts PAN (by a factor of two for both aircraft). The errors in the model calculations are attributed to uncertainty in emissions estimates and uncertainty in the top and lateral boundary conditions. Results from a series of sensitivity simulations examining the impact of the growth of emissions in Asia from 2000 to 2006, the importance of biomass burning, the effect of using boundary conditions from different global models, and the role of heterogeneous chemistry on the predictions are also presented. The impacts of heterogeneous reactions at specific times during dust transport episodes can be significant, and in the presence of dust both sulfate and nitrate aerosol production is increased and gas phase nitric acid levels are reduced appreciably (~50%). The aging of the air masses during the long range transport over the Pacific and the impact of various sources (source regions as well as energy and biomass burning) on targeted observations are analyzed using back-trajectories and tagged CO-tracer analysis.

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