California’s winter tule fog — hated by drivers, but needed by fruit and nut trees — has declined dramatically over the past three decades, raising a red flag for the state’s multibillion dollar agricultural industry, according to new research.
Crops such as almonds, pistachios, cherries, apricots and peaches go through a necessary winter dormant period brought on and maintained by colder temperatures. Tule fog, a thick ground fog that descends upon the state’s Central Valley between late fall and early spring, helps contribute to this winter chill.
Tule fog drifts through a walnut orchard south of Meridian, along the Sacramento River.
Copyright Anthony Dunn Photography. For reprint permission, go to http://www.adunnphotography.com/
A satellite image shows a thick bank of fog blanketing the Central Valley of California. A new study finds that tule fog, a thick ground fog that descends upon the Central Valley between late fall and early spring, has declined dramatically over the past three decades.
“The trees need this dormant time to rest so that they can later develop buds, flowers and fruit during the growing season,” said University of California, Berkeley biometeorologist and study lead author Dennis Baldocchi, whose father grew almonds and walnuts in Antioch and Oakley. “An insufficient rest period impairs the ability of farmers to achieve high quality fruit yields.”
The study, published May 15 in the journal Geophysical Research Letters, a journal of the American Geophysical Union, has implications for the entire country since many of these California crops account for 95 percent of U.S. production, the authors noted.
The researchers paired NASA and National Oceanic and Atmospheric Administration satellite records with data from a network of University of California weather stations, covering 32 consecutive winters. There was a great deal of variability from year to year, but on average, the researchers found a 46 percent drop in the number of fog days between the first of November and the end of February.
“The year-to-year variability we saw was likely influenced by whether the season was relatively wet or dry,” said Baldocchi, a professor in UC Berkeley’s Department of Environmental Science, Policy and Management. “Generally, when conditions are too dry or too wet, we get less fog. If we’re in a drought, there isn’t enough moisture to condense in the air. During wet years, we need the rain to stop so that the fog can form.”
Other studies have marked the decline in the Central Valley of winter chill – the number of hours between 0 and 7 degrees Celsius (32 and 45 degrees Fahrenheit). The number of hours of winter chill has dropped by several hundred since the 1950s, the study authors noted.
But ambient air temperature alone may not adequately reflect the heat experienced by the crops, said Baldocchi. Direct sunlight can heat the buds so that they are warmer than the surrounding air temperature. As a result, fog is important in shielding the buds from the sun and helping them accumulate winter chill.
Climate forecasts suggest that the accumulation of winter chill will continue to decrease in the Central Valley. Baldocchi said that fruit developers are already trying to develop cultivars that can tolerate less winter chill.
“Farmers may also need to consider adjusting the location of orchards to follow the fog, so to speak,” said Baldocchi. “Some regions along the foothills of the Sierra are candidates, for instance. That type of change is a slow and difficult process, so we need to start thinking about this now.”
The study was co-authored by Eric Waller, a UC Berkeley Ph.D. student in the Department of Environmental Science, Policy and Management. The California Energy Commission supported this research.
The American Geophysical Union is dedicated to advancing the Earth and space sciences for the benefit of humanity through its scholarly publications, conferences, and outreach programs. AGU is a not-for-profit, professional, scientific organization representing more than 62,000 members in 144 countries. Join our conversation on Facebook, Twitter, YouTube, and other social media channels.
Notes for Journalists
Journalists and public information officers (PIOs) of educational and scientific institutions who have registered with AGU can download a PDF copy of this accepted article by clicking on this link: http://onlinelibrary.wiley.com/doi/10.1002/2014GL060018/abstract
Or, you may order a copy of the final paper by emailing your request to Nanci Bompey at email@example.com. Please provide your name, the name of your publication, and your phone number.
Neither the paper nor this press release is under embargo.
“Winter fog is decreasing in the fruit growing region of the Central Valley of California”
Dennis Baldocchi and Eric Waller: Department of Environmental Science, Policy and Management, University of California, Berkeley, California, USA.
Contact information for the authors:
Dennis Baldocchi: +1 (510) 642-2874, firstname.lastname@example.org.
+1 (202) 777-7524
University of California Berkeley Contact:
+1 (510) 643-7741
Nanci Bompey | American Geophysical Union
Volcanoes get quiet before they erupt!
24.06.2016 | Carnegie Institution for Science
New technique settles old debate on highest peaks in US Arctic
24.06.2016 | European Geosciences Union
Physicists in Innsbruck have realized the first quantum simulation of lattice gauge theories, building a bridge between high-energy theory and atomic physics. In the journal Nature, Rainer Blatt‘s and Peter Zoller’s research teams describe how they simulated the creation of elementary particle pairs out of the vacuum by using a quantum computer.
Elementary particles are the fundamental buildings blocks of matter, and their properties are described by the Standard Model of particle physics. The...
A year and a half on the outer wall of the International Space Station ISS in altitude of 400 kilometers is a real challenge. Whether a primordial bacterium...
Researchers at Case Western Reserve University have developed a way to swiftly and precisely control electron spins at room temperature.
A physics experiment performed at the National Institute of Standards and Technology (NIST) has enhanced scientists' understanding of how free neutrons decay...
Chemically the same, graphite and diamonds are as physically distinct as two minerals can be, one opaque and soft, the other translucent and hard. What makes...
09.06.2016 | Event News
24.05.2016 | Event News
20.05.2016 | Event News
24.06.2016 | Materials Sciences
24.06.2016 | Physics and Astronomy
24.06.2016 | Physics and Astronomy