Spatiotemporal Patterns and Trends of the Holiday Climate Index Along the Black Sea Coastal Zone of Türkiye (1950–2025)
This study presents the first comprehensive long-term assessment (1950–2025) of tourism climate suitability along Türkiye's Black Sea coast using a novel weighted Holiday Climate Index, revealing that while summer conditions remain stable, climate change is significantly extending favorable tourism windows into spring and autumn, with improvements being more pronounced in the western provinces than in the humid east.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
Imagine you are a travel agent trying to figure out the perfect time to book a vacation. You know that weather is the invisible boss of tourism; it decides whether you'll be sunbathing on a beach, hiking a mountain, or stuck inside a museum because it's pouring rain. For decades, scientists have tried to measure this "vacation comfort" using math. They started with a tool called the Tourism Climate Index (TCI), which was like a basic checklist: is it hot? Is it raining? Is the wind blowing? But travelers realized this checklist was a bit too rigid and didn't quite capture what people actually feel or prefer. So, scientists invented a newer, smarter tool called the Holiday Climate Index (HCI). Think of the HCI as a more sophisticated mood ring for the weather. Instead of just checking boxes, it asks, "How does this temperature feel with the humidity? Is the sky clear enough for a photo? Is the wind too strong for a picnic?" It weighs these factors differently depending on whether you are looking for a beach day (where sunshine is king) or a city stroll (where comfortable temperatures matter most). Understanding these patterns is crucial because as the planet warms, the "perfect vacation window" might be shifting, and destinations need to know if they are becoming better or worse places to visit.
This paper is like a massive, 75-year-long detective story about the weather along the Black Sea coast of Türkiye. The authors, a team of climate scientists, decided to take a fresh look at this region, stretching from the western province of Düzce all the way to the eastern edge at Artvin. They didn't just look at old weather station logs; they used a super-detailed digital map of the atmosphere (called ERA5-Land) that covers every inch of the coast from 1950 to 2025. To make their map truly accurate, they created a special "hybrid" score. Since some parts of the coast are famous for beaches while others are known for city tourism, they didn't just pick one rule. Instead, they blended the "Beach Score" and the "City Score" together, weighting them based on how much of each type of land exists in every province. It's like grading a school not just on math or art, but on a mix of both, depending on what the school specializes in.
The big reveal from their investigation is that the Black Sea coast is a tale of two coasts. The western and central parts of the coast are the "cool kids" of the region, consistently offering better and more stable weather for tourists. However, the eastern part, especially around the provinces of Rize and Trabzon, is a bit more moody. Because of the steep mountains meeting the sea, this area is often shrouded in clouds, humidity, and rain, which keeps the "vacation comfort" score lower, no matter how much the rest of the world warms up.
When the scientists looked at how things have changed over the last three-quarters of a century, they found a surprising twist. They expected the summer months to be getting even better, but the data suggests otherwise. The summer weather has actually stayed pretty much the same—stable, but not significantly improving. The real magic is happening in the "shoulder seasons": spring and autumn. The study suggests that climate change is acting like a time-stretcher, pushing the comfortable weather earlier into the spring and holding it later into the autumn. It's as if the vacation season is slowly expanding its arms, offering a longer window of opportunity for travelers who don't mind avoiding the peak summer crowds.
The authors point out that this isn't a uniform change across the whole map. The western side of the Black Sea is seeing a clear improvement in these spring and autumn conditions, while the eastern side is still fighting against its natural tendency for rain and clouds. They explicitly rule out the idea that summer is becoming drastically better; in fact, for some spots, the extra heat and humidity might even make it slightly less comfortable. The paper concludes that while the region is becoming a more attractive destination overall, the benefits are uneven. The best strategy for the future isn't just to pack more sunbathers into July, but to embrace the longer, milder seasons of spring and fall, turning the Black Sea coast into a year-round destination rather than just a summer one.
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