Temporal dynamics of roost snags of long-legged myotis in the Pacific Northwest, USA

2012 ◽  
Vol 76 (6) ◽  
pp. 1310-1316 ◽  
Author(s):  
Michael J. Lacki ◽  
Michael D. Baker ◽  
Joseph S. Johnson
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
The Pacific

SPATIAL AND TEMPORAL DYNAMICS OF WOOD IN HEADWATER STREAMS OF THE PACIFIC NORTHWEST

2005 ◽  
Vol 41 (4) ◽  
pp. 899-919 ◽  
Author(s):  
Marwan A. Hassan ◽  
Dan L. Hogan ◽  
Stephen A. Bird ◽  
Christine L. May ◽  
Takashi Gomi ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Headwater Streams ◽  
Spatial And Temporal Dynamics ◽  
The Pacific

scholarly journals Ecosystem fluxes of carbonyl sulfide in an old-growth forest: temporal dynamics and responses to diffuse radiation and heat waves

2018 ◽  
Vol 15 (23) ◽  
pp. 7127-7139 ◽  
Author(s):  
Bharat Rastogi ◽  
Max Berkelhammer ◽  
Sonia Wharton ◽  
Mary E. Whelan ◽  
Frederick C. Meinzer ◽  
...  
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Heat Waves ◽  
Carbonyl Sulfide ◽  
Diffuse Radiation ◽  
Field Studies ◽  
Old Growth ◽  
Old Growth Forest ◽  
The Pacific ◽  
The Us

Abstract. Carbonyl sulfide (OCS) has recently emerged as a tracer for terrestrial carbon uptake. While physiological studies relating OCS fluxes to leaf stomatal dynamics have been established at leaf and branch scales and incorporated into global carbon cycle models, the quantity of data from ecosystem-scale field studies remains limited. In this study, we employ established theoretical relationships to infer ecosystem-scale plant OCS uptake from mixing ratio measurements. OCS fluxes showed a pronounced diurnal cycle, with maximum uptake at midday. OCS uptake was found to scale with independent measurements of CO2 fluxes over a 60 m tall old-growth forest in the Pacific Northwest of the US (45∘49′13.76′′ N, 121∘57′06.88′′ W) at daily and monthly timescales under mid–high light conditions across the growing season in 2015. OCS fluxes were strongly influenced by the fraction of downwelling diffuse light. Finally, we examine the effect of sequential heat waves on fluxes of OCS, CO2, and H2O. Our results bolster previous evidence that ecosystem OCS uptake is strongly related to stomatal dynamics, and measuring this gas improves constraints on estimating photosynthetic rates at the ecosystem scale.

Building Confidence in Shell: Variations in the Marine Radiocarbon Reservoir Correction for the Northwest Coast Over the Past 3,000 Years

2004 ◽  
Vol 69 (4) ◽  
pp. 771-786 ◽  
Author(s):  
Jennie N. Deo ◽  
John O. Stone ◽  
Julie K. Stein
Keyword(s):  
Pacific Northwest ◽  
Temporal Dynamics ◽  
Puget Sound ◽  
Archaeological Sites ◽  
Calibration Curves ◽  
Spatial And Temporal Dynamics ◽  
The Pacific ◽  
Correction Curve ◽  
Age Estimates ◽  
Gulf Of Georgia

In many regions, fluctuations have occurred through time in the local 14C activity of seawater. Evaluating these shifts and their effects on 14C age estimates is difficult, and, as a result, archaeologists working in coastal settings tend to preferentially date charcoal samples over shell. Our research on 18 charcoal–shell pairs from Puget Sound and Gulf of Georgia archaeological sites helps elucidate the spatial and temporal dynamics associated with marine reservoir effects in the Pacific Northwest. This analysis suggests that between 0 and 500 B.P. the regional correction value (ΔR) is 400 years, which agrees with the modern value determined by Stuiver and others. Between 500 and 1200 B.P., however, ΔR dips close to zero, possibly reflecting a decrease in offshore upwelling. From 1200 to 3000 B.P., ΔR returns to 400 years. These data are presented as a Puget Sound/Gulf of Georgia regional correction curve for the late Holocene, which local researchers may use to calibrate dates of marine shell. In addition, we detail our methods for constructing calibration curves and present guidelines for archaeologists working in other coastal settings to develop calibration curves for their regions.

Suitability of Natural Areas for Representing Ecological Change in the Pacific Northwest

2019 ◽  
Vol 39 (4) ◽  
pp. 452
Author(s):  
Margaret H. Massie ◽  
Todd M. Wilson ◽  
Anita T. Morzillo ◽  
Emilie B. Henderson
Keyword(s):  
Pacific Northwest ◽  
Ecological Change ◽  
Natural Areas ◽  
The Pacific
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