Nitric Acid

HNO₃

Nitric acid (HNO₃) is a very water soluble, acidic gas.
In the atmosphere it is formed by the conversion of nitrogen monoxide into nitrogen dioxide, and ultimately into nitric acid. It readily reacts with atmospheric water to produce acidic precipitation. Nitric acid also reacts with gaseous ammonia to form particulate or aerosol nitrate, which in turn is removed by wet and dry deposition of the particles. In the clean background troposphere, its removal in precipitation acts as a sink for odd hydrogen and nitrogen compounds and limits the formation of ozone.

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Click on the corresponding 'WHOM access' links in the table below to access products containing specific parameter.

Parameter	Units	Platform /Instrument	Data Products
			Begin Date	End Date	Data Access		Doc
HNO3 Profiles	vmr	Aura/MLS	2004-08-08	Current	ML2HNO3		Y
		Aura/HIRDLS	2004-07-15	Current	HIRDLS2		Y
HNO3 Profiles, mixing ratios at different pressure levels (Global Gridded, at equal intervals of latitude/or equal intervals of time)	vmr	Aura/MLS	2004-08-08	Current	ML2HNO3		Y
		UARS/CLAES	1991-10-25	1993-05-05	UARCL3AL		Y
					UARCL3AT		Y
		UARS/MLS	1991-09-18	1999-07-28	UARML3AT		Y
					UARML3AL		Y
		Nimbus-7/LIMS	1978-10-25	1985-05-01	LIMSN7L2		Y