ATMOSPHERIC SCIENCE. Response to Comment on "Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere".
نویسندگان
چکیده
Ye et al. have determined a maximum nitrous acid (HONO) yield of 3% for the reaction HO2·H2O + NO2, which is much lower than the yield used in our work. This finding, however, does not affect our main result that HONO in the investigated Po Valley region is mainly from a gas-phase source that consumes nitrogen oxides.
منابع مشابه
Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere.
Gaseous nitrous acid (HONO) is an important precursor of tropospheric hydroxyl radicals (OH). OH is responsible for atmospheric self-cleansing and controls the concentrations of greenhouse gases like methane and ozone. Due to lack of measurements, vertical distributions of HONO and its sources in the troposphere remain unclear. Here, we present a set of observations of HONO and its budget made ...
متن کاملResponse to Comment on “Missing gas-phase source of HONO inferred from Zeppelin measurements in the troposphere”
T he self-cleansing capacity of the atmosphere is largely dependent on the concentration level of hydroxyl radicals (OH) (1). Nitrous acid (HONO) is an important precursor of OH in the troposphere (2–4). Based on observations of HONO and its budget in the Po Valley region in Italy, we concluded that HONO formation in a sunlit layer separated from the ground surface is from a gas-phase source co...
متن کاملMeasurement of atmospheric nitrous acid at Bodgett Forest during BEARPEX2007
Nitrous acid (HONO) is an important precursor of the hydroxyl radical (OH) in the lower troposphere. Understanding HONO chemistry, particularly its sources and contribution to HOx (=OH+HO2) production, is very important for understanding atmospheric oxidation processes. A highly sensitive instrument for detecting atmospheric HONO based on wet chemistry followed by liquid waveguide long path abs...
متن کاملAtmospheric observations of enhanced NO2-HONO conversion on mineral dust particles
[1] Nitrous acid is an important precursor for OH radicals in the polluted troposphere. The heterogeneous conversion of NO2 to HONO, however, is currently not well understood. Measurements of HONO and NO2 in Phoenix in summer 2001 using long path DOAS show ratios of chemically formed secondary [HONO] to [NO2] that rarely exceeded 3%. During two nocturnal dust storm events, however, a significan...
متن کاملSoil nitrite as a source of atmospheric HONO and OH radicals.
Hydroxyl radicals (OH) are a key species in atmospheric photochemistry. In the lower atmosphere, up to ~30% of the primary OH radical production is attributed to the photolysis of nitrous acid (HONO), and field observations suggest a large missing source of HONO. We show that soil nitrite can release HONO and explain the reported strength and diurnal variation of the missing source. Fertilized ...
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عنوان ژورنال:
- Science
دوره 348 6241 شماره
صفحات -
تاریخ انتشار 2015