Observation of the transport of polluted air masses from the northeastern United States to Cape Sable Island, Nova Scotia, Canada, during the 1993 NARE summer intensive

Knapp, K.; Balsley, B. B.; Jensen, Mark J.; Hanson, Howard P.; Birks, John W.

doi:10.1029/97jd01832

Cited by 15 publications

(7 citation statements)

References 20 publications

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“…It is to be noted that the occurrence of high ozone mixing ratios are found in the altitude range of the second mixed layer. Similar ozone layers have been observed over the AS and the Indian Ocean during INDOEX conducted in February-March 1999 [Lelieveld et al, 2001;Simpson and Raman, 2003] and in other marine regions such as the coastal regions of the United States and Canada [Paluch et al, 1992;Knapp et al, 1998;Prados et al, 1999].…”

Section: Vertical Distributions Of Ozonesupporting

confidence: 72%

Vertical distribution of ozone in the lower troposphere over the Bay of Bengal and the Arabian Sea during ICARB-2006: Effects of continental outflow

Srivastava¹,

Lal²,

Venkataramani³

et al. 2011

J. Geophys. Res.

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[1] Measurements of vertical distributions of ozone and meteorological parameters were made over the Bay of Bengal (BOB) and Arabian Sea (AS) from ocean research vessel Sagar Kanya during the period of 18 March to 10 May 2006 as a part of the Integrated Campaign for Aerosols, Gases and Radiation Budget (ICARB). The observations showed a highly polluted layer (average ozone ∼68.0 ± 10.1 ppbv) over the northern BOB as compared to the northern AS (51.5 ± 7.6 ppbv), southern BOB (42.7 ± 12.8 ppbv), and southern AS (40.9 ± 9.5 ppbv) in the altitude range of 1-3 km. In this altitude range, specific humidity was lower by about 2-6 g/kg, and temperature was higher by 1°C-3°C over the northern BOB and northern AS as compared to their southern counterparts. This comparison and the total potential source contribution function analysis indicate that the observations over the northern BOB and the northern AS were influenced by the transport of continental air masses. The outflow from the polluted atmosphere over northern India, particularly over the Indo-Gangetic Plain, resulted in higher mixing ratios of ozone over the northern BOB. The air masses from the northern Indian region contributed an enhancement of about 13 ± 6 ppbv to the mixing ratio of ozone over the BOB in the altitude range of 0.75-3.0 km. The mixing ratios of ozone in the unperturbed marine air masses were found to be 11 ± 6 and 5 ± 2 ppbv lower than the average ozone over the BOB and AS, respectively. These results clearly show the outflow of continental air containing high ozone and possibly other pollutants over the northern BOB, which can have significant implications in the chemistry and climate of relatively cleaner regions.

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Section: Vertical Distributions Of Ozonesupporting

confidence: 72%

Vertical distribution of ozone in the lower troposphere over the Bay of Bengal and the Arabian Sea during ICARB-2006: Effects of continental outflow

Srivastava¹,

Lal²,

Venkataramani³

et al. 2011

J. Geophys. Res.

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“…There is compelling observational and modeling evidence of the link between continental U.S. emissions and the global atmosphere. Knapp et al [1998] observed enhanced ozone (90 -130 ppbv) just above the boundary layer over Cape Sable Island, Nova Scotia during the 1993 North Atlantic Regional Experiment (NARE). Back trajectory analysis indicated that these air masses had origins over the heavily industrialized N. E. United States.…”

Section: Introductionmentioning

confidence: 99%

Chemical data assimilation estimates of continental U.S. ozone and nitrogen budgets during the Intercontinental Chemical Transport Experiment–North America

Pierce¹,

Schaack²,

Al-Saadi³

et al. 2007

J. Geophys. Res.

114

125

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Global ozone analyses, based on assimilation of stratospheric profile and ozone column measurements, and NOy predictions from the Real‐time Air Quality Modeling System (RAQMS) are used to estimate the ozone and NOy budget over the continental United States during the July–August 2004 Intercontinental Chemical Transport Experiment–North America (INTEX‐A). Comparison with aircraft, satellite, surface, and ozonesonde measurements collected during INTEX‐A show that RAQMS captures the main features of the global and continental U.S. distribution of tropospheric ozone, carbon monoxide, and NOy with reasonable fidelity. Assimilation of stratospheric profile and column ozone measurements is shown to have a positive impact on the RAQMS upper tropospheric/lower stratosphere ozone analyses, particularly during the period when SAGE III limb scattering measurements were available. Eulerian ozone and NOy budgets during INTEX‐A show that the majority of the continental U.S. export occurs in the upper troposphere/lower stratosphere poleward of the tropopause break, a consequence of convergence of tropospheric and stratospheric air in this region. Continental U.S. photochemically produced ozone was found to be a minor component of the total ozone export, which was dominated by stratospheric ozone during INTEX‐A. The unusually low photochemical ozone export is attributed to anomalously cold surface temperatures during the latter half of the INTEX‐A mission, which resulted in net ozone loss during the first 2 weeks of August. Eulerian NOy budgets are shown to be very consistent with previously published estimates. The NOy export efficiency was estimated to be 24%, with NOx + PAN accounting for 54% of the total NOy export during INTEX‐A.

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“…The northeastern United States is of particular interest with regard to acidic aerosol because of its downwind location relative to industrial areas in the midwestern United States and major metropolitan areas along the eastern seaboard of the United States. Previous work has shown that regional transport greatly affects the air quality of New England [ Knapp et al , 1998; Schultz et al , 1998; Fischer et al , 2004; Mao and Talbot , 2004a, 2004b]. The International Consortium for Atmospheric Research on Transport and Transformation (ICARTT) campaign was conducted during the summer of 2004 to increase the understanding of air quality parameters in North America and to understand how the long‐range transport of pollution across the Atlantic Ocean affects air quality downwind [ Fehsenfeld et al , 2006].…”

Section: Introductionmentioning

confidence: 99%

Aerosol acidity in rural New England: Temporal trends and source region analysis

et al. 2007

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Observation of the transport of polluted air masses from the northeastern United States to Cape Sable Island, Nova Scotia, Canada, during the 1993 NARE summer intensive

Cited by 15 publications

References 20 publications

Vertical distribution of ozone in the lower troposphere over the Bay of Bengal and the Arabian Sea during ICARB-2006: Effects of continental outflow

Vertical distribution of ozone in the lower troposphere over the Bay of Bengal and the Arabian Sea during ICARB-2006: Effects of continental outflow

Chemical data assimilation estimates of continental U.S. ozone and nitrogen budgets during the Intercontinental Chemical Transport Experiment–North America

Aerosol acidity in rural New England: Temporal trends and source region analysis

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