التفاصيل البيبلوغرافية
| العنوان: |
Southern Hemisphere atmospheric history of carbon monoxide over the late Holocene reconstructed from multiple Antarctic ice archives |
| المؤلفون: |
Faïn, X, Etheridge, DM, Fourteau, K, Martinerie, P, Trudinger, CM, Rhodes, RH, Chellman, NJ, Langenfelds, RL, McConnell, JR, Curran, MAJ, Brook, EJ, Blunier, T, Teste, G, Grilli, R, Lemoine, A, Sturges, WT, Vannière, B, Freitag, J, Chappellaz, J |
| بيانات النشر: |
Copernicus GmbH
Department of Earth Sciences
//doi.org/10.5194/cp-19-2287-2023
Climate of the Past |
| سنة النشر: |
2023 |
| المجموعة: |
Apollo - University of Cambridge Repository |
| مصطلحات موضوعية: |
37 Earth Sciences, 3709 Physical Geography and Environmental Geoscience, 3705 Geology, 13 Climate Action |
| الوصف: |
Abstract. Carbon monoxide (CO) is a naturally occurring atmospheric trace gas, a regulated pollutant, and one of the main components determining the oxidative capacity of the atmosphere. Evaluating climate–chemistry models under different conditions than today and constraining past CO sources requires a reliable record of atmospheric CO mixing ratios ([CO]) that includes data since preindustrial times. Here, we report the first continuous record of atmospheric [CO] for Southern Hemisphere (SH) high latitudes over the past 3 millennia. Our continuous record is a composite of three high-resolution Antarctic ice core gas records and firn air measurements from seven Antarctic locations. The ice core gas [CO] records were measured by continuous flow analysis (CFA), using an optical feedback cavity-enhanced absorption spectrometer (OF-CEAS), achieving excellent external precision (2.8–8.8 ppb; 2σ) and consistently low blanks (ranging from 4.1±1.2 to 7.4±1.4 ppb), thus enabling paleo-atmospheric interpretations. Six new firn air [CO] Antarctic datasets collected between 1993 and 2016 CE at the DE08-2, DSSW19K, DSSW20K, South Pole, Aurora Basin North (ABN), and Lock-In sites (and one previously published firn CO dataset at Berkner) were used to reconstruct the atmospheric history of CO from ∼1897 CE, using inverse modeling that incorporates the influence of gas transport in firn. Excellent consistency was observed between the youngest ice core gas [CO] and the [CO] from the base of the firn and between the recent firn [CO] and atmospheric [CO] measurements at Mawson station (eastern Antarctica), yielding a consistent and contiguous record of CO across these different archives. Our Antarctic [CO] record is relatively stable from −835 to 1500 CE, with mixing ratios within a 30–45 ppb range (2σ). There is a ∼5 ppb decrease in [CO] to a minimum at around 1700 CE during the Little Ice Age. CO mixing ratios then increase over time to reach a maximum of ∼54 ppb by ∼1985 CE. Most of the industrial period [CO] ... |
| نوع الوثيقة: |
article in journal/newspaper |
| وصف الملف: |
application/pdf |
| اللغة: |
English |
| Relation: |
https://www.repository.cam.ac.uk/handle/1810/363807 |
| الاتاحة: |
https://www.repository.cam.ac.uk/handle/1810/363807 |
| Rights: |
Attribution 4.0 International ; https://creativecommons.org/licenses/by/4.0/ |
| رقم الانضمام: |
edsbas.D6BB273C |
| قاعدة البيانات: |
BASE |