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"Heather, D."
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Impact of fossil fuel emissions on atmospheric radiocarbon and various applications of radiocarbon over this century
Radiocarbon analyses are commonly used in a broad range of fields, including earth science, archaeology, forgery detection, isotope forensics, and physiology. Many applications are sensitive to the radiocarbon (14C) content of atmospheric CO₂, which has varied since 1890 as a result of nuclear weapons testing, fossil fuel emissions, and CO₂ cycling between atmospheric, oceanic, and terrestrial carbon reservoirs. Over this century, the ratio14C/C in atmospheric CO₂ (Δ14CO₂) will be determined by the amount of fossil fuel combustion, which decreases Δ14CO₂ because fossil fuels have lost all14C from radioactive decay. Simulations of Δ14CO₂ using the emission scenarios from the Intergovernmental Panel on Climate Change Fifth Assessment Report, the Representative Concentration Pathways, indicate that ambitious emission reductions could sustain Δ14CO₂ near the preindustrial level of 0‰ through 2100, whereas “business-as-usual” emissions will reduce Δ14CO₂ to −250‰, equivalent to the depletion expected from over 2,000 y of radioactive decay. Given current emissions trends, fossil fuel emission-driven artificial “aging” of the atmosphere is likely to occur much faster and with a larger magnitude than previously expected. This finding has strong and as yet unrecognized implications for many applications of radiocarbon in various fields, and it implies that radiocarbon dating may no longer provide definitive ages for samples up to 2,000 y old.
Journal Article
Stalinist city planning : professionals, performance, and power
\"Based on research in previously closed Soviet archives, this book sheds light on the formative years of Soviet city planning and on state efforts to consolidate power through cityscape design. Stepping away from Moscow's central corridors of power, Heather D. DeHaan focuses her study on 1930s Nizhnii Novgorod, where planners struggled to accommodate the expectations of a Stalinizing state without sacrificing professional authority and power. Bridging institutional and cultural history, the book brings together a variety of elements of socialism as enacted by planners on a competitive urban stage, such as scientific debate, the crafting of symbolic landscapes, and state campaigns for the development of cultured cities and people. By examining how planners and other urban inhabitants experienced, lived, and struggled with socialism and Stalinism, DeHaan offers readers a much broader, more complex picture of planning and planners than has been revealed to date.\"--Dust jacket.
Book
Siberian taiga and tundra fire regimes from 2001–2020
Circum-boreal and -tundra systems are crucial carbon pools that are experiencing amplified warming and are at risk of increasing wildfire activity. Changes in wildfire activity have broad implications for vegetation dynamics, underlying permafrost soils, and ultimately, carbon cycling. However, understanding wildfire effects on biophysical processes across eastern Siberian taiga and tundra remains challenging because of the lack of an easily accessible annual fire perimeter database and underestimation of area burned by MODIS satellite imagery. To better understand wildfire dynamics over the last 20 years in this region, we mapped area burned, generated a fire perimeter database, and characterized fire regimes across eight ecozones spanning 7.8 million km 2 of eastern Siberian taiga and tundra from ∼61–72.5° N and 100° E–176° W using long-term satellite data from Landsat, processed via Google Earth Engine. We generated composite images for the annual growing season (May–September), which allowed mitigation of missing data from snow-cover, cloud-cover, and the Landsat 7 scan line error. We used annual composites to calculate the difference Normalized Burn Ratio (dNBR) for each year. The annual dNBR images were converted to binary burned or unburned imagery that was used to vectorize fire perimeters. We mapped 22 091 fires burning 152 million hectares (Mha) over 20 years. Although 2003 was the largest fire year on record, 2020 was an exceptional fire year for four of the northeastern ecozones resulting in substantial increases in fire activity above the Arctic Circle. Increases in fire extent, severity, and frequency with continued climate warming will impact vegetation and permafrost dynamics with increased likelihood of irreversible permafrost thaw that leads to increased carbon release and/or conversion of forest to shrublands.
Journal Article
Analyzing COVID-19 disinformation on Twitter using the hashtags #scamdemic and #plandemic: Retrospective study
The use of social media during the COVID-19 pandemic has led to an \"infodemic\" of mis- and disinformation with potentially grave consequences. To explore means of counteracting disinformation, we analyzed tweets containing the hashtags #Scamdemic and #Plandemic.
Using a Twitter scraping tool called twint, we collected 419,269 English-language tweets that contained \"#Scamdemic\" or \"#Plandemic\" posted in 2020. Using the Twitter application-programming interface, we extracted the same tweets (by tweet ID) with additional user metadata. We explored descriptive statistics of tweets including their content and user profiles, analyzed sentiments and emotions, performed topic modeling, and determined tweet availability in both datasets.
After removal of retweets, replies, non-English tweets, or duplicate tweets, 40,081 users tweeted 227,067 times using our selected hashtags. The mean weekly sentiment was overall negative for both hashtags. One in five users who used these hashtags were suspended by Twitter by January 2021. Suspended accounts had an average of 610 followers and an average of 6.7 tweets per user, while active users had an average of 472 followers and an average of 5.4 tweets per user. The most frequent tweet topic was \"Complaints against mandates introduced during the pandemic\" (79,670 tweets), which included complaints against masks, social distancing, and closures.
While social media has democratized speech, it also permits users to disseminate potentially unverified or misleading information that endangers people's lives and public health interventions. Characterizing tweets and users that use hashtags associated with COVID-19 pandemic denial allowed us to understand the extent of misinformation. With the preponderance of inaccessible original tweets, we concluded that posters were in denial of the COVID-19 pandemic and sought to disperse related mis- or disinformation resulting in suspension.
Leveraging 227,067 tweets with the hashtags #scamdemic and #plandemic in 2020, we were able to elucidate important trends in public disinformation about the COVID-19 vaccine.
Journal Article
10-Year Update on Study Results Submitted to ClinicalTrials.gov
A decade after ClinicalTrials.gov launched a database for reporting results of clinical trials, the database includes results of approximately 36,000 trials. The authors discuss laws, regulations, and policies relevant to results reporting, trends over time in the frequency of reporting, and adherence to requirements for the completeness and quality of the results reported.
Journal Article
Fundamentals of health psychology
Bringing together an internationally respected team of experts, this title continues to offer a comprehensive introduction to the key topics and approaches in the fast-growing field of health psychology.
Book
Internet-delivered cognitive behaviour therapy for chronic health conditions: a systematic review and meta-analysis
This systematic review and meta-analysis aims to evaluate the effectiveness of internet-delivered cognitive behavioural therapy (ICBT) on anxiety and depression among persons with chronic health conditions. A systematic database search was conducted of MEDLINE, CINAHL, PsycInfo, EMBASE, and Cochrane for relevant studies published from 1990 to September 2018. A study was included if the following criteria were met: (1) randomized controlled trial involving an ICBT intervention; (2) participants experienced a chronic health condition; (3) participants ≥ 18 years of age; and (4) effects of ICBT on anxiety and/or depression were reported. The Cochrane Risk of Bias tool was used to assess the risk of bias on the included studies. Pooled analysis was conducted on the primary and condition specific secondary outcomes. Twenty-five studies met inclusion criteria and investigated the following chronic health conditions: tinnitus (n = 6), fibromyalgia (n = 3), pain (n = 7), rheumatoid arthritis (n = 3), cardiovascular disease (n = 2), diabetes (n = 1), cancer (n = 1), heterogeneous chronic disease population (n = 1), and spinal cord injury (n = 1). Pooled analysis demonstrated small effects of ICBT in improving anxiety and depression. Moderate effects of therapist-guided approach were seen for depression and anxiety outcomes; while, self-guided approaches resulted in small effects for depression and moderate effects in anxiety outcomes. ICBT shows promise as an alternative to traditional face-to-face interventions among persons with chronic health conditions. Future research on long-term effects of ICBT for individuals with chronic health conditions is needed.Trial Registration PROSPERO registration number: CRD42018087292.
Journal Article