Drops of Weather. (by Diego Fdez-Sevilla PhD)

Drops of Weather. (by Diego Fdez-Sevilla PhD)

ResearchGate  DOI: 10.13140/RG.2.2.33796.63360

The possibility of facing a weakening Jet Stream due to a decrease in the Thermal contrast between the Subtropical and Polar atmospheric regions has created scenarios in which the variations in meteorological conditions for a particular location can come without a transition. One week is freezing cold and the next pretty warm. How can that happen?

The large north-south waves in the jet stream (Rossby waves) are occurring more frequently and may be increasing in amplitude. Larger waves can cause cool air to be pushed toward the equator when the waves dip to low latitudes, and warm air to be pushed toward the poles when the waves swing back. For areas on the ground below these waves, that translates into wild and unseasonable temperature extremes, sometimes called “weather whiplash.”

rossby-wavesMasses of air crossing the Jet Stream

Such scenario can be seen nowadays when we look at the graphic representations created to simulate the prediction for the Western European meteorological conditions in the period between the 3th of March and the 14th of March 2015.

Here I have created a video with the sequence of images generated for this period so you can appreciate the forecast describing the behaviour of the phase/limit where both masses of air get in contact and how it looks like a fluid releasing “drops of weather”.

(Western Europe. Meteorological forecast for the period between the 3th of March and the 14th of March 2015. Subjected to changes due to updating processes.)

The implications raising from such type of atmospheric behaviour are yet to be fully understood. To begin with, the possibility of having sudden intrusions of masses of air inducing extreme changes in meteorological variables might affect the life cycle of the biota since the most of it, plants and animals, follows changes on Temp and Humidity suffering behavioural, hormonal and physiological alterations. Also it must be considered the rapid respond to those variables from species with a quick metabolism. Many of which, insects and fungi, might suffer blooming rates of growth coinciding with a vulnerable stage in the development of other species like crops and wild plants. This scenario opens questions which I believe are worthy to be included in a debate about “the possibility of its increasing frequency in the near future”, also discussed in previous posts  (UPGRADED 11 March2015) Revisiting the theory of “Facing a decrease in the differential gradients of energy in atmospheric circulation” by Diego Fdez-Sevilla.)


Sudden changes in temperature might induce flowering too early or, getting affected by frostbites, depending on whether the intrusion carries warm or cold air.

I leave here one example from a paper which tackles such kind of scenarios for plants looking at the implications that raising uncertainties carry into the system of production for the food industry and agricultural practices.

Climate change and the flowering time of annual crops. (2009, P. Q. Craufurd* and T. R. Wheeler).


Crop production is inherently sensitive to variability in climate. Temperature is a major determinant of the rate of plant development and, under climate change, warmer temperatures that shorten development stages of determinate crops will most probably reduce the yield of a given variety. Earlier crop flowering and maturity have been observed and documented in recent decades, and these are often associated with warmer (spring) temperatures. However, farm management practices have also changed and the attribution of observed changes in phenology to climate change per se is difficult. Increases in atmospheric [CO2] often advance the time of flowering by a few days, but measurements in FACE (free air CO2 enrichment) field-based experiments suggest that elevated [CO2] has little or no effect on the rate of development other than small advances in development associated with a warmer canopy temperature. The rate of development (inverse of the duration from sowing to flowering) is largely determined by responses to temperature and photoperiod, and the effects of temperature and of photoperiod at optimum and suboptimum temperatures can be quantified and predicted. However, responses to temperature, and more particularly photoperiod, at supraoptimal temperature are not well understood. Analysis of a comprehensive data set of time to tassel initiation in maize (Zea mays) with a wide range of photoperiods above and below the optimum suggests that photoperiod modulates the negative effects of temperature above the optimum. A simulation analysis of the effects of prescribed increases in temperature (0–6 °C in +1 °C steps) and temperature variability (0% and +50%) on days to tassel initiation showed that tassel initiation occurs later, and variability was increased, as the temperature exceeds the optimum in models both with and without photoperiod sensitivity. However, the inclusion of photoperiod sensitivity above the optimum temperature resulted in a higher apparent optimum temperature and less variability in the time of tassel initiation. Given the importance of changes in plant development for crop yield under climate change, the effects of photoperiod and temperature on development rates above the optimum temperature clearly merit further research, and some of the knowledge gaps are identified herein.


Animals might find affected their behavioural and physical features as these follows seasonal changes linked with temperature.

Here I want to leave another paper which tackles such kind of uncertainties for animals looking at the implications that such scenarios carry for two groups of animals, the Lepidoptera (butterflies and moths) and birds. In both groups, extreme weather events appear to drive local population dynamics.

Impacts of Extreme Weather and Climate on Terrestrial Biota.  (2000, Camille Parmesan, Terry L. Root, and Michael R. Willig)


Climate is a driver of biotic systems. It affects individual fitness, population dynamics, distribution and abundance of species, and ecosystem structure and function. Regional variation in climatic regimes creates selective pressures for the evolution of locally adapted physiologies, morphological adaptations (e.g., color patterns, surface textures, body shapes and sizes), and behavioral adaptations (e.g., foraging strategies and breeding systems). In the absence of humans, broad-scale, long-term consequences of climatic warming on wild organisms are generally predictable. Evidence from Pleistocene glaciations indicates that most species responded ecologically by shifting their ranges poleward and upward in elevation, rather than evolutionary through local adaptation (e.g., morphological changes). But these broad patterns tell us little about the relative importance of gradual climatic trends as compared to extreme weather events in shaping these processes. Here, evidence is brought forward that extreme weather events can be implicated as mechanistic drivers of broad ecological responses to climatic trends. They are, therefore, essential to include in predictive biological models, such as doubled CO2 scenarios.

Human activity

The usage of resources might suffer unexpected demands which may trigger collapses in the demand as well as it would increase pressure into the infrastructures coping with the situation. Depending on the type of masses of air coming over the same location we may see sudden changes in the demand of Energy, water, …

There are also possible impacts over the human health since seasonal allergies have become an increasing problem in our societies, decreasing performance in our activities and demanding health care and resources.

Biological productivity and Atmospheric circulation

As I have addressed in this blog in previous posts, there is a synergistic relationship between biological productivity and atmospheric circulation. The alteration of one of the components may induce a feedback response into the other.


(This post is part of a more complex piece of independent research. I believe that the hypothesis that I have presented in previous posts in this blog (here and here) could help to understand present and possible future scenarios in atmospheric circulation. However, this is an assessment based on observation which needs to be validated throughout open discussion and data gathering. So please feel free to incorporate your thoughts and comments in a constructive manner.

I would like to not only be the one proposing this theory but also be involved in this line of research. Since I am in a transition period looking for a position in research, I publicly ask for institutional and economic support to find the means to contribute evaluating the accuracy of this theory.

(If you feel like sharing this post I would appreciate to have a reference about the place or platform, by private or public message, in order for me to have the opportunity to join the debate and be aware of the repercussion which might generate d.fdezsevilla(at)gmail.com)

For anybody interested in the posts related with this discussion here I leave you those more relevant in chronological order (there are comments bellow some of them. Please check them out):

  • New theory proposal to assess possible changes in Atmospheric Circulation (by Diego Fdez-Sevilla)
    Posted on October 21, 2014. http://wp.me/p403AM-k3
  • Why there is no need for the Polar Vortex to break in order to have a wobbling Jet Stream and polar weather? (by Diego Fdez-Sevilla)
    Posted on November 14, 2014. http://wp.me/p403AM-mt
  • Gathering data to make visible the invisible (by Diego Fdez-Sevilla)
    Posted on December 22, 2014. http://wp.me/p403AM-pN
  • State of the Polar Vortex. Broken? From 29 Nov 2014 to 5th Jan 2015 (by Diego Fdez-Sevilla). Posted on November 29, 2014. http://wp.me/p403AM-o7
  • Probability in the atmospheric circulation dictating the Weather (by Diego Fdez-Sevilla)
    Posted on January 15, 2015. http://wp.me/p403AM-rm
  • Meteorological Outlook Feb 2015 (by Diego Fdez-Sevilla) Posted on February 7, 2015. http://wp.me/p403AM-sU
  • (UPGRADED) Revisiting the theory of “Facing a decrease in the differential gradients of energy in atmospheric circulation” by Diego Fdez-Sevilla.
    Posted on February 10, 2015. http://wp.me/p403AM-to

About Diego Fdez-Sevilla, PhD.

Data policy The products processed by "Diego Fdez-Sevilla PhD" are made available to the public for educational and/or scientific purposes, without any fee on the condition that you credit "Diego Fdez-Sevilla PhD" as the source. Copyright notice: © Diego Fdez-Sevilla PhD 2013-2019 orcid: orcid.org/0000-0001-8685-0206 and the link to its source at diegofdezsevilla.wordpress or permanent DOI found at Reearchgate. Profile and verified scientific activity also at: https://publons.com/researcher/3387860/diego-fernandez-sevilla/ Should you write any scientific publication on the results of research activities that use Diego Fdez-Sevilla PhD products as input, you shall acknowledge the Diego Fdez-Sevilla's PhD Project in the text of the publication and provide an electronic copy of the publication (d.fdezsevilla@gmail.com). If you wish to use the Diego Fdez-Sevilla PhD products in advertising or in any commercial promotion, you shall acknowledge the Diego Fdez-Sevilla PhD Project and you must submit the layout to Diego Fdez-Sevilla PhD for approval beforehand (d.fdezsevilla@gmail.com). The work here presented has no economic or institutional support. Please consider to make a donation to support the means for making sustainable the energy, time and resources required. Also any sponsorship or mentoring interested would be welcome. Intellectual Property This article is licensed under a Creative Commons Attribution 4.0 International License. By Diego Fdez-Sevilla, PhD. More guidance on citing this web as a source can be found at NASA webpage: http://solarsystem.nasa.gov/bibliography/citations#! For those publications missing at the ResearchGate profile vinculated with this project DOIs can be generated on demand by request at email: d.fdezsevilla(at)gmail.com. **Author´s profile: Born in 1974. Bachelor in General Biology, Masters degree "Licenciado" in Environmental Sciences (2001, Spain). PhD in Aerobiology (2007, UK). Lived, acquired training and worked in Spain, UK, Germany and Poland. I have shared the outcome from my work previous to 2013 as scientific speaker in events held in those countries as well as in Switzerland and Finland. After 12 years performing research and working in institutions linked with environmental research and management, in 2013 I found myself in a period of transition searching for a new position or funding to support my own line of research. In the current competitive scenario, in order to demonstrate my capacities instead of just moving my cv waiting for my next opportunity to arrive, I decided to invest my energy and time in opening my own line of research sharing it in this blog. In March 2017 the budget reserved for this project has ended and its weekly basis time frame discontinued until new forms of economic and/or institutional support are incorporated into the project. The value of the data and the original nature of the research presented in this platform and at LinkedIn has proved to be worthy of consideration by the scientific community as well as for publication in scientific journals. However, without a position as member of an institution, it becomes very challenging to be published. I hope that this handicap do not overshadow the value of my achievements and that the Intellectual Property Rights generated with the license of attribution attached are respected and considered by the scientist involved in similar lines of research. **Any comment and feedback aimed to be constructive is welcome as well as any approach exploring professional opportunities.** In this blog I publish pieces of research focused on addressing relevant environmental questions. Furthermore, I try to break the barrier that academic publications very often offer isolating scientific findings from the general public. In that way I address those topics which I am familiar with, thanks to my training in environmental research, making them available throughout my posts. (see "Framework and Timeline" for a complete index). At this moment, 2019, I am living in Spain with no affiliation attachments. Free to relocate geographically worldwide. If you feel that I could be a contribution to your institution, team and projects, don´t hesitate in contact me at d.fdezsevilla (at) gmail.com or consult my profile at LinkedIn, ResearchGate and Academia.edu. Also, I'd appreciate information about any opportunity that you might know and believe it could match with my aptitudes. The conclusions and ideas expressed in each post as part of my own creativity are part of my Intellectual Portfolio and are protected by Intellectual Property Laws. Licensed under Creative Commons Attribution-NonCommercial conditions. In citing my work from this website, be sure to include the date of access and DOIs found at the Framework and Timeline page and ResearchGate. (c)Diego Fdez-Sevilla, PhD, 2018. Filling in or/and Finding Out the gaps around. Publication accessed 20YY-MM-DD at https://diegofdezsevilla.wordpress.com/ ***
This entry was posted in Aerobiology, Biological productivity, Energy Balance, Environmental Resilience, Extreme climatic events, Filling in, Polar vortex and Jet Stream, Uncategorized, Water vapour and tagged , , , , , , , , , , , , , , . Bookmark the permalink.

101 Responses to Drops of Weather. (by Diego Fdez-Sevilla PhD)

  1. Pingback: Rayleigh–Taylor instabilities in Atmospheric Circulation. Follow-Up on Atmospheric Dynamics and Climatic Implications (By Diego Fdez-Sevilla PhD) | Diego Fdez-Sevilla, PhD.

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