Rick Ketler

Rick Ketler
University of British Columbia - Vancouver | UBC · Faculty of Land and Food Systems

About

28
Publications
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448
Citations
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January 2012 - present

Publications

Publications (28)
Article
Partitioning measured net ecosystem exchange of CO2 (NEE) into ecosystem respiration (Re) and gross primary production (GPP) is essential for understanding the biophysical controls on forest ecosystem carbon (C) dynamics. Obtaining Re and GPP accurately from NEE remains a challenge. In this study, we measured stable CO2 isotopologue signatures at e...
Article
Douglas-fir (Pseudotsuga menziesii) forests in the Pacific Northwest are the most productive managed forests in North America. Nitrogen (N) fertilizers are generally applied in this region to increase the rate of tree growth and consequently carbon (C) sequestration. However, the long-term effects of N fertilization on C and water exchanges of Doug...
Article
Full-text available
Many peatlands have been drained and harvested for peat mining, agriculture, and other purposes, which has turned them from carbon (C) sinks into C emitters. Rewetting of disturbed peatlands facilitates their ecological recovery and may help them revert to carbon dioxide (CO2) sinks. However, rewetting may also cause substantial emissions of the mo...
Article
Full-text available
A method for directly measuring carbon dioxide (CO2) emissions using a mobile sensor network in cities at fine spatial resolution was developed and tested. First, a compact, mobile system was built using an infrared gas analyzer combined with open-source hardware to control, georeference, and log measurements of CO2 mixing ratios on vehicles (car,...
Conference Paper
Full-text available
Diurnal and seasonal changes of δ 13 C and δ 18 O in carbon dioxide measured by eddy covariance over an urban surface The isotopic composition of the greenhouse gas CO 2 can provide valuable information about its sources. For example , linear mixing models have been used to identify the sources of enhanced CO 2 in the urban atmosphere using urban a...
Article
Full-text available
A method for directly measuring carbon dioxide (CO2) emissions using a mobile sensor network in cities at fine spatial resolution was developed and tested. First, a compact, mobile system was built using an infrared gas analyzer combined with open-source hardware to control, georeference and log measurements of CO2 mixing ratios on vehicles (car, b...
Technical Report
Full-text available
Burns Bog Ecological Conservancy Area (BBECA) in Metro Vancouver is a part of a large disturbed raised bog ecosystem that is currently being managed to promote ecological recovery through rewetting. Restoration efforts aimed at raising the water table through damming of drainage structures have been in place since 2005. This study quantified summer...
Technical Report
Full-text available
The isotopic composition (δ<sup>13</sup>C and δ18O) in atmospheric carbon dioxide (CO<sub>2</sub>) originating from gasoline and diesel vehicle exhaust and from natural gas combustion was determined. Gasoline and diesel samples were taken in the exhaust of representative vehicles of the fleet in Vancouver, BC, Canada between November 2013 and May 2...
Conference Paper
Stand-replacing disturbances, such as harvesting, have a major impact on the exchange of carbon dioxide (CO2) between forested land and the atmosphere. The former forest CO2 sinks become net CO2 sources due to the continued respiratory losses of CO2 and to the significantly reduced photosynthetic uptake of CO2. The duration and magnitude of this ca...
Conference Paper
Full-text available
The most important long-lived greenhouse gas (LLGHG) emitted during combustion of fuels is carbon dioxide (CO2), however also traces of the LLGHGs methane (CH4) and nitrous oxide (N2O) are released, the quantities of which depend largely on the conditions of the combustion process. Emission factors determine the mass of LLGHGs emitted per energy us...
Conference Paper
Full-text available
Chronosequence studies, where current different-aged stands are used to reconstruct the development of an older stand, have been used to characterize the net ecosystem productivity (NEP) at different stand ages following disturbances. Almost no replicated observations have been made within the Fluxnet community comparing the NEP of similarly aged s...
Conference Paper
Disturbance to forest ecosystems due to insect attacks may impact not only regional and global climate but also the microclimate within forest canopies. Recently the mountain pine beetle (MPB) epidemic in Western Canada resulted in large-scale impacts on climate and stand structure. The killing of trees changes the vertical distribution of net radi...
Technical Report
Full-text available
As part of the EPiCC Network, the University of British Columbia / Department of Geography monitored energy, water, and carbon balances in two suburban neighborhoods in Vancouver, BC, Canada in 2008-2009. Two flux towers, ‘Vancouver-Sunset’ and ‘Vancouver-Oakridge’, were operated in extensive residential areas composed of single-family homes. A rur...
Article
Full-text available
The issue of fast-growing crops originally goes back to early 1970th. Fast-growing crops initially dominated as a way of obtaining the raw material for producing cellulose. In subsequent years, with the development of technology, the range of benefits of this type crops began to increase - for example crops found use in the purification of industri...
Conference Paper
Full-text available
Disturbance to northern forest ecosystems due to insect attacks may impact not only the microclimate but also regional to global scale carbon (C) cycling by decreasing photosynthetic carbon dioxide (CO2) uptake and increasing respiratory CO2 loss. Most recently the epidemic mountain pine beetle (MPB) outbreak in Western Canada has resulted in large...
Conference Paper
Full-text available
Disturbance to northern forest ecosystems due to insect attacks may impact not only regional and global climate but also the microclimate within forest canopies. Recently the mountain pine beetle (MPB) epidemic in Western Canada resulted in large-scale impacts on climate and stand structure. The killing of trees changes the vertical distribution of...
Conference Paper
An observational experiment was conducted during the summer of 2009 at the Canadian Carbon Program's British Columbia Flux Station to determine the incidence and magnitude of advective carbon dioxide (CO2) fluxes. The site is located in a tall (Zh = 35 m), dense (1100 stems/ha) Douglas-fir forest on a 5-10o slope. Katabatic flows occur within the s...
Article
Many forest management methods alterstand density uniformly. The effectsof such a change on the wind andturbulence regimes in the forest arecritical to a number of processes governingthe stability of the stand and itsmicroclimate. We measured wind speed andturbulence statistics with a Dantec tri-axialhot-film probe in model forests of variousdensit...
Article
Abstract To evaluate the carbon budget of a boreal deciduous forest, we measured CO2 fluxes using the eddy covariance technique above an old aspen (OA) forest in Prince Albert National Park, Saskatchewan, Canada, in 1994 and 1996 as part of the Boreal Ecosystem-Atmosphere Study (BOREAS). We found that the OA forest is a strong carbon sink sequester...

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Projects

Projects (3)
Archived project
This NSERC Strategic Project (2009-2011) under the Lead of Prof. A. Black (UBC) brought together atmospheric scientists, ecophysiologists, and forest scientists from BC Universities, the Canadian Forest Service, and the BC Ministry of Forests and Range to assess the impact of different forest management strategies following Mountain Pine Beetle attacks on carbon emissions / sequestration, forest water balances and microclimates. In this project, we directly measured carbon and water balances, ecophysiological changes and microclimates at four flux towers in interior British Columbia a multi-year experiment. A multi-level flux divergence experiment was be conducted to investigate the changes in microclimate and growth conditions within the canopies and to identify the vertical distribution of sources, sinks and the exchange processes of sensible heat, water and carbon-dioxde in attacked forest stands.
Project
Part of the Burns Bog Ecological Conservancy Area (BBECA), a 20 km2 wetland in Metro Vancouver, BC, Canada, is currently undergoing restoration to promote its ecological recovery from past disturbances such as peat harvesting and associated drainage. The restoration management aims at raising the bog's water table by a large-scale ditch-blocking program to impede drainage. This rewetting of disturbed bog ecosystems may change emissions and uptake of long-lived atmospheric greenhouse gases such as carbon dioxide or methane. This project performs long-term measurements of fluxes of methane and carbon-dioxide on a floating tower to retrieve emission estimates across seasons by means of eddy covariance (EC). Photos of the tower can be found here: https://flic.kr/s/aHsky46p9v
Project
The following papers use / rely on data measured at the University of British Columbia (UBC)'s long-term urban flux tower "Vancouver-Sunset" (Fluxnet ID "Ca-VSu") in Vancouver, Canada. This 30-m tall tower has been in continuous operation since 2008 and in intermittent operation since 1978. Details can be found under FLUXNET: https://fluxnet.ornl.gov/site/4132, Photos of the site can be found here: https://flic.kr/s/aHsky6neQB