Direct measurement of NO<sub>3</sub> reactivity in a boreal forest DOI Creative Commons

Jonathan Liebmann,

Einar Karu,

Nicolas Sobanski

и другие.

Опубликована: Ноя. 16, 2017

Abstract. We present the first direct measurements of NO3 reactivity (or inverse lifetime, s−1) in Finnish boreal forest. The data were obtained during IBAIRN campaign (Influence Biosphere-Atmosphere Interactions on Reactive Nitrogen budget) which took place Hyytiälä, Finland summer/autumn transition September 2016. was generally very high with a maximum value 0.94 s−1 and displayed strong diel variation campaign-averaged nighttime mean 0.11 compared to daytime 0.04 s−1. highest NO3-reactivity accompanied by major depletion canopy level ozone associated temperature inversions levels monoterpenes. sufficiently large that reactions organic trace gases could compete photolysis reaction NO. There no significant reduction measured between beginning end indicating any seasonal emissions reactive biogenic offset from forest floor. Observations hydrocarbons (BVOC) suggested dominant role for monoterpenes determining reactivity. Reactivity not accounted in-situ measurement NO BVOCs variable across cycle with, average, circa 30 % “missing” 60 missing day. Measurement at various heights (8.5 25 m) both above below canopy, revealed nighttime, vertical gradient values closest ground. disappeared due efficient mixing.

Язык: Английский

Greening of a boreal rich fen driven by CO2 fertilisation DOI Creative Commons
Sandeep Thayamkottu, T. Luke Smallman,

Jaan Pärn

и другие.

Agricultural and Forest Meteorology, Год журнала: 2024, Номер 359, С. 110261 - 110261

Опубликована: Окт. 18, 2024

Язык: Английский

Процитировано

0
Direct measurement of NO<sub>3</sub> reactivity in a boreal forest DOI Creative Commons

Jonathan Liebmann,

Einar Karu,

Nicolas Sobanski

и другие.

Опубликована: Ноя. 16, 2017

Abstract. We present the first direct measurements of NO3 reactivity (or inverse lifetime, s−1) in Finnish boreal forest. The data were obtained during IBAIRN campaign (Influence Biosphere-Atmosphere Interactions on Reactive Nitrogen budget) which took place Hyytiälä, Finland summer/autumn transition September 2016. was generally very high with a maximum value 0.94 s−1 and displayed strong diel variation campaign-averaged nighttime mean 0.11 compared to daytime 0.04 s−1. highest NO3-reactivity accompanied by major depletion canopy level ozone associated temperature inversions levels monoterpenes. sufficiently large that reactions organic trace gases could compete photolysis reaction NO. There no significant reduction measured between beginning end indicating any seasonal emissions reactive biogenic offset from forest floor. Observations hydrocarbons (BVOC) suggested dominant role for monoterpenes determining reactivity. Reactivity not accounted in-situ measurement NO BVOCs variable across cycle with, average, circa 30 % “missing” 60 missing day. Measurement at various heights (8.5 25 m) both above below canopy, revealed nighttime, vertical gradient values closest ground. disappeared due efficient mixing.

Язык: Английский

Процитировано

0