A sharp rise in the Korean won’s value against the dollar is clouding the earnings outlook for the nation’s major exporters, including automakers and chipmakers, according to market analysts Tuesday. In broad terms, a stronger local currency offers welcome relief to the broader economy by easing inflationary pressures and lowering import costs. The main concern, however, is the speed of the change. A rapid rise in the won can lead to unexpected earnings losses for export-dependent companies as they have limited time to adjust product prices or production plans in response to foreign exchange swings. On top of that, they may have to reverse the benefits of a weaker won that were previously factored into their earnings forecasts. The recent decline in the exchange rate, driven by a stronger won, has been unusually steep. Data released Monday by the Bank of Korea showed that the won-dollar exchange rate fell 8.09 percent in July alone, marking the sixth-largest monthly decline since the market average exchange rate system was introduced in March 1990. It was the sharpest one-month drop